Thomas Jefferson sent the Corps of Discovery into the Lousiana Territory is because he wanted to see if there were any water routes to the Pacific Ocean.
Settlers in the territory wanted the same approach to slavery as in the states they came from.
The French explored the Mississippi because they wanted to find new lands and build trading posts.
The Federalists
They wanted to control the United States Market.
Both the United States and England wanted Oregon in 1848. Instead of going to war, the United States went to war with Mexico and gained far more territory. The United States and England signed a peace treaty. The United States made out like a bandit. It got far and away the best piece of land.
American farmers living in the Mexican territory of Texas wanted the same land rights and permissions that they would have in the United States. When the Mexicans refused, the Texans decided that they would secede and hope that the United States would annex them.
Settlers in the territory wanted the same approach to slavery as in the states they came from.
The United States.
Because that would mean war with the United States - and the last time that Mexico and the United States went to war, Mexico lost half of its national territory.
Alaska was purchased because the government wanted to expand the United States. Russia needed the money but didn't want the British to get it.
Answer this question… The Soviet Union wanted to encourage the spread of communist ideals, but the United States did not.