Louisiana Purchase (1803) - Map illustrating the vast territory acquired by the United States from France, highlighting the Mississippi River and the newly acquired lands.

- The Louisiana Purchase of 1803 doubled the size of the United States.
- It added approximately 828,000 square miles of territory west of the Mississippi River.
- This acquisition extended U.S. borders from the Mississippi River to the Rocky Mountains and from the Gulf of Mexico to Canada.
- The purchase gave the United States control of the vital port of New Orleans and navigation rights on the Mississippi River.
- It removed French presence from North America and significantly reduced the threat of European colonial powers in the region.
- The land acquired included parts or all of 15 present-day U.S. states and two Canadian provinces.
- The purchase price was $15 million, which amounted to about four cents per acre.
- It opened vast new lands for American settlement and agricultural expansion.
- The acquisition fueled westward expansion and set the stage for Manifest Destiny.
- It required the U.S. government to manage relations with numerous Native American tribes living in the newly acquired territory.