When the United States purchased me. I almost doubled the country's size. What am I?

The Louisiana Territory

Explanation:

When the Thomas Jefferson purchased the Louisiana territory in 1803, it nearly doubled the the country's size.

I think it's Louisiana that was bought and almost doubled the size. Because in 1803, the United States nearly doubled in size when it bought the Louisiana Territory in a deal that shaped history.

Hope this helps :)

one of the major compromises in the constitutional convention was between the small states and big states. the small states wanted each state to have the same number of representatives in congress. the big states wanted representation based on population.

b. native americans them