<span>This rivalry inspired the United States to enter into the 1848 Treaty of Guadalupe Hidalgo. Under this treaty, Mexico gave up Texas, New Mexico, and California to the United States. This was thought to be controversial during the 1840's because a lot of Americans thought that Texas should not have been annexed, and Texas claimed that it still controlled New Mexico. There was a struggle for power.</span>
C. Missouri
In fact, the Oregon Trail began in Missouri.
True, because based on scientific studies, it has been proven that a reward-based approach, rather than punishment, is more likely effective in adolescent learning :)
American Revolutionary War broke out in 1775, he befriended General George Washington, and quickly rose to become the chief artillery officer of the Continental Army. In this role he accompanied Washington on most of his campaigns, and had some involvement in many major actions of the war.
I hope it helps!!