Which war occured in 1898 and led to the American acquisition of Puerto Rico, Guam, and the Philippines?

The Spanish-American War of 1898.

Explanation:

The Spanish-American War, 1898 began between The United States and Spain as a result of numerous factors. One of the most immediate reasons was America's support for the countries of the Philippines and Cuba against their colonizers- Spain. Another reason was the explosion of the USS Maine at Havana Harbor.

At first, the explosion led to the USS Maine led to the US getting involved in the war of Cuba's independence. And eventually, the US acquired the Pacific possessions of Spain, which further led America to be involved in the Philippine Revolution. What began as a simple intervention in a war between two nations led to the US trying to strip Spain of all its overseas possessions. The war ended with a peace treaty signed in Paris that gave independence to Cuba, the United States was given Puerto Rico and Guam and also allows the United States to buy the Philippines from Spain.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.