Buffalo skulls to be ground into fertilizer
LOUISIANA PURCHASE: The United States purchases Louisiana Territory from France, nearly doubling its land area. Learn more.
LEWIS & CLARK ERA: Lewis and Clark explore the West. During this time, the buffalo population was estimated at 50,000,000 and passenger pigeons numbered up to two billion in a single flight. Learn more.
WELLAND SHIP CANAL: The Welland Ship Canal, built between Lake Erie and Lake Ontario, allows sea lamprey to enter all Great Lakes. Learn more about the Canal. Learn more about the Sea Lamprey.
1 BILLION PEOPLE: The world’s human population reaches one billion for the first time. Learn more.
FINAL TRAPPER RENDEZVOUS: The last trapper rendezvous occurs at Popo Agie Creek in Wind River Mountains, Wyoming. Learn more.
GREAT AUK EXTINCT: Great auk is the first documented species in North America to become extinct by the hand of man. Learn more.
TREATY OF GUADALUPE HIDALGO: officially ends the Mexican-American War (1846-1848). Mexico cedes Texas and the territory that will become Arizona, New Mexico, Utah, Colorado, and California. . Learn more.
DEPARTMENT OF THE INTERIOR: The U.S. Department of the Interior was established in 1849. Learn more.
MORE DISAPPEARANCES: By 1850, Eastern elk, woodland bison, and beaver are nearly gone. Learn more.