Louisiana Purchase - Definition, Facts & Importance | HISTORY

Table of ContentsFrance in the New World Louisiana Territory Changes Hands Louisiana Purchase Negotiations Legacy of the Louisiana Purchase The Louisiana Purchase of 1803 brought into the United States about 828,000 square miles of territory from France, thereby doubling the size of the young republic. What was known at the time as the Louisiana Territory stretched from the Mississippi River in the east to the Rocky Mountains in the west and from the Gulf of Mexico in the south to the Canadian border in the north. Part or all of 15 states were eventually created from the land deal, which is considered one of the most important achievements of Thomas Jefferson’s presidency.France in the New World Beginning in the 17th century, France explored the Mississippi River valley and established scattered settlements in the region. By the middle of the 18th century, France controlled more of the present-day United States than any other European power: from New Orleans northeast to the Great Lake...