12th Amendment:

The amendment that changed how president and Vice President are elected.

LA Purchase:

When France sold 530,000,000 acres of land to the U.S for $15 million.

Lewis & Clark Expedition:

An expedition led by Lewis and Clark to explore LA.

Thomas Jefferson

Characteristic:

Country Development

I think Thomas Jefferson's presidency was very helpful for development of the country. The LA Purchase doubled our size, and The Lewis & Clark Expedition explored that new land.