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530,000,000 acres of territory in North America that the United States purchased from France -
Baltimore & Ohio Railroad was the first U.S. railway for commercial transport of passengers -
Authorizing the president to grant unsettled lands west of the Mississippi in exchange for Indian lands within existing state borders. -
Mexico and United stated began fought against each other -
James W. Marshall found gold on his piece of land -
Abraham Lincoln becomes the 16th President -
Disagreement over the institution of slavery -
US congress passed the thirteenth amendment -
20th President was shot -
Conflict between Spain and United States