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1805 Lewis & Clark reach the Pacific Ocean.
1820 World human population reaches one billion.
1826 Joseph Nicephore Niepce photographs the first surviving photograph, View From The Window At Le Gras.
1830 Indian Removal Act.
1839 Photography is "founded" when the Daguerrotype is announced and William Henry Fox Talbot publishes his photographic process.
1845 Manifest Destiny is coined.
1847 US postage stamps are first issued.
1849 The Department of the Interior is established.
1854 Henry David Thoreau publishes Walden.
1858 Street letter boxes are installed.
1861 Carleton Watkins photographs Cathedral Rock, Yosemite.
1862 The Homestead Act encourages the settlement of the American West.
1865 William Stanley Jevons questions coal sustainability in publishing The Coal Question.
1866 Ecology is coined.
1872 Yellowstone National Park is established. US Congress makes Post Office an executive department.
1874 Silver gelatin paper becomes commercially available.
1877 German Nikolaus August Otto builds the four-cycle internal combustion engine, the prototype for modern car engines.
1878 Eadward Muybridge photographs The Horse In Motion.
1879 US Geological Survey is established.
1883 Postcards cost four cents.
1884 Kodak Eastman invents flexible paper-based photo film.
1885 First seat belt patent.
1888 Eastman Kodak Company is founded in the United States. "You press the button, we do the rest."
1890 Yosemite & Sequoia National Parks are established.
1898 Postcards cost one cent.
1899 Mountain Rainier National Park is established.
1900 Eastman Kodak introduces the Brownie camera. Steering wheel are designed.
1902 Newlands Reclamation Act is established to fund irrigation projects in the American West. Crater Lake National Park is established.
1903 Horatio Nelson Jackson becomes first documented person to travel from San Francisco to New York using dirt roads, cow paths, and railroad beds. There is 250,000 miles of track compared to 160,000 miles of road and 141 miles of concrete highway. There are 4,000 automobiles in the United States.
1904 Edward S. Curtis photographs The Vanishing Race.
1905 Smog is coined.
1906 Antiquites Act of 1906 designates 18 National Monuments and the United States Forest Service. Alabama sets state maximum speed limit at 8 MPH.
1907 Roosevelt designates 16 million acres of new National Forests.
1908 First production Model T completed.
1910 Glacier National Park is established. Asphalt is first manufactured. New York introduces first drunk driving laws. There are 130,000 automobiles in the United States.
1916 The National Park Service is established.
1917 Nikon is founded in Japan.
1918 Wisonsin is the first state to adopt a road numbering system.
1919 Acadia, Grand Canyon, & Zion National Parks are established.
1925 Leica I becomes the first practical and commercially successful 35mm camera.
1926 Routes 66 & 101 are completed.
1927 E.O. Hoppe publishes Romantic America.
1928 Bryce Canyon National Park is established.
1929 Grand Teton National Park is established.
1930 The three way traffic light is introduced. Automobiles reach 26.7 million (1 : 4.5 Americans). Felix Moeschlin and Kurt Richter publish Amerika vom Auto Aus.
1932 Walker Evans photographs Parked Car, Small Town, Main Street.
1934 Great Smoky Mountains and Everglades National Parks are established. Route 40 is completed. James Agee essays "The Great American Roadside."
1935 First color transparency film is introduced (Kodachrome). Shenandoah National Park is established.
1936 The Hoover Dam is completed. Dorothea Lange photographs Migrant Mother. Margaret Bourke-White photographs Fort Peck Dam.
1937 Polaroid is founded in Massachusetts. The Golden Gate Bridge is completed.
1938 Walker Evans' American Photographs draws on a decade of travel and becomes first photographer to receive a solo show at the Museum of Modern Art.
1939 First air conditioning systems are added into cars.
1940 Pennsylvania Turnpike opens.
1944 Federal Aid Highway Act aims to create 40,000 miles to connect the major US cities.
1947 Henri-Cartier Bresson embarks on his American road trip.
1949 Aldo Leopold publishes A Sand County Almanac.
1951 Airbags are invented.
1952 First Walk/Don't Walk signal first installed in New York City.
1953 Robert Rauschenberg creates Automobile Tire Print.
1956 Interstates 70, 80 & 90 are completed.
1957 Interstates 10, 40 & 95 are completed. Jack Kerouac publishes On The Road.
1958 Robert Frank's The Americans is published.
1961 ZIP (zone improvement plan) codes are introduced.
1962 Petrified Forest National Park established. Rachel Carson publishes Silent Spring. Wisconsin becomes first state to call for seat belts in all automobiles.
1963 Kodak releases the first point-and-shoot camera (Instamatic). Polaroid introduces instant color film. Postcards cost four cents. Clean Air Act. Ed Ruscha publishes Twentysix Gasoline Stations.
1964 Wilderness Act enacted. Canyonlands National Park established.
1966 Blue Ridge Parkway completed. Department of Transportation established. Guadalupe Mountains National Park established.
1968 Appalachian & Pacific Crest Trails established. Redwood & North Cascades National Parks are established. William Anders photographs Earthrise.
1970 Environmental Protection Agency established by executive order. First Earth Day celebrated April 22nd.
1971 Arches, Capitol Reef & Voyageurs National Parks are established.
1973 Endangered Species Act established. Interstate 70 opens from Denver westwards.
1974 National speed limit set to 55 MPH. CFCs first hypothesized to cause ozone thinning.
1975 Steven Sasson of Eastman Kodak invents digital photography. Postcards cost nine cents.
1977 Final railway postal running.
1978 Postcards - ten cents. Untitled Film Still 21, Cindy Sherman. Badlands & Theodore Roosevelt National Parks established.
1980 Biscayne, Channel Islands, Glacier Bay, Katmai, Kenai Fjords, Kobuk Valley, Lake Clark, Wrangell-St. Elias & Gates of the Arctic National Parks established.
1981 Postcards - thirteen cents.
1982 Androgyny (6 Men + 6 Women), Nancy Burson.
1984 New York is first state to require seat belts. Michael Jordan, Co Rentmeester.
1985 Postcards - fifteen cents. Route 66 decommissioned.
1986 Great Basin National Park established.
1987 Human world population - 5,000,000,000. USPS switches from Jeeps to life long vehicles.
1988 American Somoa National Park established.
1989 Exxon Valdez oil spill.
1990 Clean Air Act Amendments.
1991 Postcards cost nineteen cents.
1992 Interstate 70 completed. Dry Tortugas National Park is established.
1994 Joshua Tree, Death Valley & Saguaro National Parks are established.
1995 GPS navigation systems introduced.
1997 First Toyota Prius is sold in Japan. Philippe Kahn photographs First Cell-Phone Picture.
1999 Andreas Gursky photographs #54 99 Cent. Black Canyon Of The Gunnison National Park established. World human population reaches six billion.
2000 Cuyahoga National Park is established.
2003 Congaree National Park is established.
2004 Great Sand Dunes National Park is established.
2006 Al Gore releases An Inconvenient Truth.
2011 Human world population reaches seven billion.
2013 Pinnacles National Park is established.