There are several reasons for the changes. The US purchased land from France known as the Louisiana Purchase and then they had an expedition by two people known as Merriweather Lewis and William Clark explored land along the Mississippi, Missouri, and Snake River and claimed any of the land that wasn't already the US's the US's (this included Oregon). Texas asked to join the US but Mexico didn't want to give it up so America a few wars with Mexico and got more land each time. Mexico also gave California to the US and the US bought some land from Mexico as well and Alaska and Hawaii voted to join the United States as well.
No
The Soviet Union set off an atomic bomb
What caused a fear of communism, and how did it change American policy
It set the border between the U.S. and Canada at 49 degree North Latitude as far west as the rocky mountains. And Us and Mexico
The Bombing of Pearl Harbor
The new boundaries caused confusion and conflict.
No. The Haitian earthquake was caused by a transform boundary.
Population changes cause the boundaries of congressional districts to change in Tennessee. Glad to help.
Arbitrarily formed boundaries caused wars between rival tribes.
european exploration caused much exploration of the united states and helped give us more knowledge of the world . european exploration has caused the us to be what is is today without them exploring to the west of europe the us would not be what it is today
They were formed by deposition and by convergent boundaries
Crossing boundaries help us to reach our potential in life i guess
it can be caused by many things, such as hot spots, convergent plate boundaries, and divergent plate boundaries
They drew boundaries.
Borders often change after wars when winning armies hold new territory
Immigration had huge impacts on laws in the US, hence more people coming to US caused more rules to be reinforced.
No