1783: Spain regains control of Florida after the British surrender at Yorktown, which effectively grants the United States of ...

The Louisiana Purchase of 1803 sparked a new wave of exploration in the United ... An expedition along the Red River would take American explorers closer to Spanish territory than any ...

1803: The United States pays France $15 million for the Louisiana territory. 1808: As of Jan. 1, importing human beings for slavery is banned in the United States.