The correct answer to the question above would be the last option, "in multiple countries all over the world." Terrorist attacks by fundamentalist groups have occurred in multiple countries all over the world. They have been doing recent terrorist attacks, one in Paris last year and Syria.
To defend its nation against threats from an aggressor nation
I believe it would be globalization.
<span>I think you mean this, "Shortly after the United States victory in the Spanish-American War, U.S. forces _____." According to researches that I've read, the answer to your question would be "U.S. forces </span>fought against an insurrection in the Philippines".