John Adams, the second president of the United States.

John Adams

John Adams, the second president of the United States.

John Quincy Adams, son of John Adams and sixth president of the United States.

John Quincy Adams

John Quincy Adams, son of John Adams and sixth president of the United States.

The seal of the Department of Agriculture of the United States.

Seal of the Department of Agriculture

The seal of the Department of Agriculture of the United States.

The United States seal of Alabama.

Alabama

The United States seal of Alabama.

The Great Seal of Alabama, 1911. The image depicts a bald eagle holding a banner that reads "Here we rest." It is holding arrows and standing on a shield decorated with stars and stripes.

Seal of Alabama

The Great Seal of Alabama, 1911. The image depicts a bald eagle holding a banner that reads "Here we…

The official seal of the U.S. state of Alabama.

Seal of Alabama

The official seal of the U.S. state of Alabama.

The United States seal of The District of Alaska.

Alaska

The United States seal of The District of Alaska.

The state banner of Alaska.

Alaska

The state banner of Alaska.

The Seal of the District of Alaska, 1911. The image on the seal shows Alaska's mountains and shore.

Seal of Alaska

The Seal of the District of Alaska, 1911. The image on the seal shows Alaska's mountains and shore.

Also known as Castanea pumila. The branch of an Allegheny Chinkapin tree, native to the eastern United States.

Branch of Allegheny Chinkapin

Also known as Castanea pumila. The branch of an Allegheny Chinkapin tree, native to the eastern United…

The branch of an Amelanchier obovalis tree, native to North America.

Branch of Amelanchier Obovalis

The branch of an Amelanchier obovalis tree, native to North America.

An illustration of America's organization for war as in 1944.

America's Organization for War (1944)

An illustration of America's organization for war as in 1944.

Also known as Platanus occidentalis. The branch of an American Sycamore tree, native throughout the central and eastern parts of the United States.

Branch of American Sycamore

Also known as Platanus occidentalis. The branch of an American Sycamore tree, native throughout the…

The state banner of Arizona, the apache state.

Arizona

The state banner of Arizona, the apache state.

Also known as Alnus oblongifolia. The branch of an Arizona Alder tree, native to southwestern United States and Mexico.

Branch of Arizona Alder

Also known as Alnus oblongifolia. The branch of an Arizona Alder tree, native to southwestern United…

The Seal of the Territory of Arizona, 1863. The image on the seal shows mountains, forests, and a deer. Underneath is Arizona's state motto, 'Ditat Deus,' meaning "God enriches."

Seal of Arizona

The Seal of the Territory of Arizona, 1863. The image on the seal shows mountains, forests, and a deer.…

Also known as Platanus wrightii. The branch of an Arizona Sycamore, native to Arizona and New Mexico.

Branch of Arizona Sycamore

Also known as Platanus wrightii. The branch of an Arizona Sycamore, native to Arizona and New Mexico.

The United States seal of Arkansas.

Arkansas

The United States seal of Arkansas.

The state banner of Arkansas, the bear state.

Arkansas

The state banner of Arkansas, the bear state.

The Seal of the State of Arkansas. The seal shows Mercy, a bald eagle holding a shield, and the sword of justice.

Seal of Arkansas

The Seal of the State of Arkansas. The seal shows Mercy, a bald eagle holding a shield, and the sword…

Also known as Salix lasiolepis. The branch of an Arroyo Willow tree, native to western and southwestern North America.

Branch of Arroyo Willow

Also known as Salix lasiolepis. The branch of an Arroyo Willow tree, native to western and southwestern…

Also known as Chamaecyparis thyoides. Native to the eastern part of the United States.

Branch of Atlantic White Cypress

Also known as Chamaecyparis thyoides. Native to the eastern part of the United States.

An image of a bald cypress, in pyramidal cultivated form. It is otherwise known as taxodium distichum, and is native to the southeastern United States.

Bald Cypress in Cultivated Form

An image of a bald cypress, in pyramidal cultivated form. It is otherwise known as taxodium distichum,…

An image of a bald cypress in swamp form, with aerating roots, or knees. It is otherwise known as taxodium distichum, and is native to the southeastern United States.

Bald Cypress in Swamp Form

An image of a bald cypress in swamp form, with aerating roots, or knees. It is otherwise known as taxodium…

Also known as Taxodium distichum. A species of conifer native to the southeastern United States.

Pine Cone of Bald Cypress

Also known as Taxodium distichum. A species of conifer native to the southeastern United States.

Also known as Abies balsamea. A North American fir, generally found in most of the eastern and central areas of the United States and Canada.

Pine Cone of Balsam Fir

Also known as Abies balsamea. A North American fir, generally found in most of the eastern and central…

Also known as Salix bebbiana. The branch of a Beaked Willow, native to Canada and the northern United States.

Branch of Beaked Willow

Also known as Salix bebbiana. The branch of a Beaked Willow, native to Canada and the northern United…

Also known as Magnolia macrophylla. The branch of a Bigleaf Magnolia tree, native to the southeastern United States and eastern Mexico.

Branch of Bigleaf Magnolia

Also known as Magnolia macrophylla. The branch of a Bigleaf Magnolia tree, native to the southeastern…

Also known as Pinus muricata, mostly found in California.

Bishop Pine Cone

Also known as Pinus muricata, mostly found in California.

Also known as Salix nigra. The branch of a Black Willow tree, native to eastern North America.

Branch of Black Willow

Also known as Salix nigra. The branch of a Black Willow tree, native to eastern North America.

Also known as Quercus marilandica. The branch of a Blackjack Oak, native to the southern and central United States.

Branch of Blackjack Oak

Also known as Quercus marilandica. The branch of a Blackjack Oak, native to the southern and central…

The eighth President of the United States, serving from 1837 to 1841.

Martin van Buren

The eighth President of the United States, serving from 1837 to 1841.

The United States seal of California with the Golden Gate in the background.

California

The United States seal of California with the Golden Gate in the background.

The state banner of California.

California

The state banner of California.

Also known as Juniperus californica. A species of juniper native mainly to California.

Branch of California Juniper

Also known as Juniperus californica. A species of juniper native mainly to California.

The Great Seal of the State of California. The seal shows Eureka with a bear cub. In the background are mountains and ships.

Seal of California

The Great Seal of the State of California. The seal shows Eureka with a bear cub. In the background…

The Capitol at Washington in 1814.

Capitol at Washington, 1814

The Capitol at Washington in 1814.

An illustration of the Capitol building in Washington DC.

Capitol Building

An illustration of the Capitol building in Washington DC.

The United States Capitol serves as the seat of government for the United States Congress, the legislative branch of the U.S. federal government. It is located in Washington, D.C., on top of Capitol Hill at the eastern end of the National Mall. Although not in the geographic center of the District of Columbia, the Capitol is the origin by which the quadrants of the district are divided. Officially, both the east and west sides of the Capitol are referred to as "fronts." Historically, however, the east front was initially the side of the building intended for the arrival of visitors and dignitaries.

Capitol Building

The United States Capitol serves as the seat of government for the United States Congress, the legislative…

The state banner of North Carolina, the old north state.

North Carolina

The state banner of North Carolina, the old north state.

The state banner of South Carolina, the palmetto state.

South Carolina

The state banner of South Carolina, the palmetto state.

Carpenters' Hall is a four-story brick building in Center City Philadelphia, Pennsylvania which played a significant part in the early history of the United States.

Carpenters' Hall

Carpenters' Hall is a four-story brick building in Center City Philadelphia, Pennsylvania which played…

The branch of a Celtis mississippiensis tree, native to the limestone hills in the United States.

Branch of Celtis Mississippiensis

The branch of a Celtis mississippiensis tree, native to the limestone hills in the United States.

The Centennial International Exhibition of 1876, the first official World's Fair in the United States, was held in Philadelphia, Pennsylvania, to celebrate the 100th anniversary of the signing of the Declaration of Independence in Philadelphia.

Centennial Exhibition Buildings

The Centennial International Exhibition of 1876, the first official World's Fair in the United States,…

An illustration of the ruins of Chambersburg, Pennsylvania.

Chambersburg

An illustration of the ruins of Chambersburg, Pennsylvania.

Also known as Quercus chapmanii. The branch of a Chapman Oak tree, native to the southeastern United States.

Branch of Chapman Oak

Also known as Quercus chapmanii. The branch of a Chapman Oak tree, native to the southeastern United…

Also known as Juniperus pachyphlaea. Native to southwestern Texas, New Mexico, Arizona, and Mexico.

Branch of Checker Barked Juniper

Also known as Juniperus pachyphlaea. Native to southwestern Texas, New Mexico, Arizona, and Mexico.

Also known as Quercus pagoda. The branch of a Cherrybark Oak tree, native to the southern United States.

Branch of Cherrybark Oak

Also known as Quercus pagoda. The branch of a Cherrybark Oak tree, native to the southern United States.

(1829-1886) American politician and twenty-first President of the United States, succeeding James Garfield.

Chester Alan Arthur

(1829-1886) American politician and twenty-first President of the United States, succeeding James Garfield.

Also known as Quercus prinus. The branch of a Chestnut Oak tree, native to the eastern United States.

Branch of Chestnut Oak

Also known as Quercus prinus. The branch of a Chestnut Oak tree, native to the eastern United States.

A branch of a Coccoloba laurifolia tree.

Branch of Coccoloba Laurifolia

A branch of a Coccoloba laurifolia tree.

Cadwallader Colden ( February 7, 1688 - September 20, 1776 ) was a physician, farmer, surveyor, botanist, and a lieutenant governor for the Province of New York.

Cadwallader Colden

Cadwallader Colden ( February 7, 1688 - September 20, 1776 ) was a physician, farmer, surveyor, botanist,…

The state banner of Colorado, the silver state.

Colorado

The state banner of Colorado, the silver state.

The Seal of Colorado, 1876. The seal shows The Eye of Providence and Colorado's motto 'Nil sine numine' meaning "Nothing without God's will.

Seal of Colorado

The Seal of Colorado, 1876. The seal shows The Eye of Providence and Colorado's motto 'Nil sine numine'…

The official state seal of Colorado.

Seal of Colorado

The official state seal of Colorado.

The seal of the Department of Commerce and Labor of the United States.

Seal of the Department of Commerce and Labor

The seal of the Department of Commerce and Labor of the United States.

Also known as Celtis occidentalis. A branch of a Common Hackberry tree, native among the central United States.

Branch of Common Hackberry

Also known as Celtis occidentalis. A branch of a Common Hackberry tree, native among the central United…

The Library of Congress is the de facto national library of the United States and the research arm of the United States Congress.

The Congressional Library

The Library of Congress is the de facto national library of the United States and the research arm of…

The Seal of the State of Connecticut (Sigillum reipublicae Connecticutensis). The seal shows three grapevines with their motto underneath, 'Qui transtulit sustinet' meaning "He who transplanted sustains."

Seal of Connecticut

The Seal of the State of Connecticut (Sigillum reipublicae Connecticutensis). The seal shows three grapevines…

Also known as Leitneria floridana. A shrub native to the southeastern United States.

Branch of Corkwood

Also known as Leitneria floridana. A shrub native to the southeastern United States.