PLS HELP!! And an explanation would be great :) How did the US change after taking control of numerous territories as a result of the Spanish-American War?

It became a world power.
It added Hawaii as a state.
It became isolated from the rest of the world.
It established military governments in its new territories.

( A ) It became a world power.

Explanation:

The global equilibrium, which had allowed the United States to grow and prosper in virtual isolation since 1815 was gone forever as the result of a short but shattering war. In 1898, U.S. domestic support for the independence of Cuba enmeshed the United States in a struggle with Spain over the fate of the island nation. The decision to aid the Cuban resistance was a major departure from the traditional American practice of liberal nationalism, and the results of that decision had far-reaching consequences. The 1898 Treaty of Paris ending the war gave Cuba its independence and also ceded important Spanish possessions to the United States—notably Puerto Rico, the Philippines, and the small island of Guam. The United States was suddenly a colonial power with overseas dependencies.

This assumption of colonial responsibilities reflected not only the temporary enthusiasms of 1898 but also marked a profound change in the diplomatic posture of the United States. The foreign policies of the early 19th century had less relevance at the dawn of the 20th century because the nation had changed. The United States had almost all the attributes of a great power—it stood ahead or nearly ahead of almost all other countries in terms of population, geographic size and location on two oceans, economic resources, and military potential.