Which statements accurately describe the expansion of the united states between 1789 and 1850?
choose all answers that are correct.
a.
the united states purchased the louisiana territory from spain in 1820.
b.
the united states annexed the republic of texas and made it a state in 1845.
c.
the united states acquired much of the southwest at the end of the mexican war.
d.
the united states occupied the oregon territory at the end of the war of 1812.