describe the lands that became part of the US under the Louisiana purchase

Answer 1

Here is an excellent primary site.

http://en.wikipedia.org/wiki/Louisiana_Purchase
Be sure to go to the other sources that are suggested here.

Answer 2

These websites should help you find information.

http://www.enchantedlearning.com/history/us/1800/louisianapurchase/

http://en.citizendium.org/wiki/Louisiana_Purchase