Final answer:
The Spanish-American War of 1898 addressed several problems for the United States, including proving themselves as a military power, establishing themselves as a rival to European imperial powers, and gaining access to new markets. However, it did not reduce the pressure of immigration.
Step-by-step explanation:
The Spanish-American War of 1898 addressed several problems for the United States, but it did not reduce the pressure of immigration since migrants were not sent to colonize Cuba after the war.
The war gave American men a chance to prove themselves both mentally and physically. The United States established itself as a legitimate rival to European imperial powers, gaining access to new markets for the sale of industrially manufactured goods. Additionally, the United States succeeded in seizing territory from Spain, including Cuba, Puerto Rico, and the Philippines, which expanded its global reach and influence.