Roosevelt's "Fireside Chat" microphone John L. Louis Babe Ruth autographed baseball - Great Depression : 1929 to 1940. James Whistler's Harmony in Blue and Gold : the Peacock Room Bernice Palmer's Kodak Brownie camera Helen Keller's watch Suffragists' "Great Demand" banner Ku Klux Klan robe and hood World War I gas mask Louis Armstrong's trumpet Scopes "Monkey Trial" photograph Spirit of St. Alexander Graham Bell's telephone Thomas Edison's lightbulb Frédéric Bartholdi's Liberty Andrew Carnegie's mansion Ford model T Wright brothers' Kitty Hawk Flyer Bakelizer plastic maker - Modern nation : 1870s to 1929. Maine - Industrial Revolution : 1865 to early Twentieth century. Albert Bierstadt's Among the Sierra Nevada, California King Kamehameha III's feather cape American buffalo Sitting Bull's drawing book Bugle from the U.S.S. Frederick Douglass's ambrotype portrait Harriet Tubman's hymnal and shawl Emancipation Proclamation pamphlet Christian Fleetwood's Medal of Honor Appomattox Court House furnishings Abraham Lincoln's hat - Manifest Destiny : 1845 to early Twentieth century.
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Lewis and Clark's pocket compass John Bull steam locomotive Samuel Colt's revolver Morse-Vail telegraph Mexican army coat Gold discovery flake from Sutter's Mill Martha, the last passenger pigeon - A house divided : 1850 to 1865. Conestoga wagon Eli Whitney's cotton gin John Deere's steel plow Isaac Singer's sewing machine Nauvoo Temple sun stone - Sea to shinning sea : 1800 to 1850s. Declaration of Independence George Washington's uniform and sword Benjamin Franklin's walking stick Gilbert Stuart's Lansdowne portrait of George Washington Star-spangled banner Thomas Jefferson's bible - Young nation : late Eighteenth century to 1850s. Christopher Columbus's portrait Spanish Mission hide painting of Saint Anthony Pocahontas's portrait Plymouth Rock fragment Slave shackles Americæ Nova Tabula (map) - Let freedom ring : 1760s to 1820s. Burgess shale fossils Bald eagle Clovis stone points Mississippian birdman copper plate - New World : 1492 to mid-Eighteenth century.
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Before Columbus : 525 million years ago to 1492.