Week 5 Why did America go to war in the 20th Century?

Read attached doc with 6 different theories of war and materials provided about 4 of the major wars of the 20th Century. Then, select one of the theories as your choice for the main reason nations went to war in the 20th Century. Next, using specific evidence from the materials provided (no additional sources needed) about each war answer the question: Why did America go to war in the 20th Century? In-text citations needed, but no works cited page required.