Answer:
Mexican American War
Spanish American War
Step-by-step explanation:
The Mexican American War was fought over land disputes in Texas between the U.S. and Mexico. Specifically whether or not Texas extended to the Rio Grande River. Eventually, it was war and the U.S. was the victor. Not only did they take the Rio Grande River, but they also took New Mexico, Utah, Nevada, Arizona, California, Texas, and western Colorado. This was a war entirely over land and with America emerging victorious our country was expanded by a third.
The Spanish American War began with Cuba revolting against Spain. America wanted to intervene for Cuba's side so when the USS Maine exploded the U.S. pinned the blame on Spain. America declared war and won. Cuba was given its Independence but, Guam, The Philipines, and Puerto Rico were all added to America's ever-growing landmass.
These two examples show how the U.S. used military force to take more land for themselves which in itself is imperialist.