The Neutrality Acts established the policy that kept the United States out of foreign wars during the interwar years by creating a formal, law-based stance of neutrality. Passed in the mid-1930s, these laws restricted actions that could draw the U.S. into conflicts—banning arms sales and loans to belligerents and enforcing cash-and-carry trade rather than credit sales. This legal framework aimed to prevent entanglements similar to those that pulled the United States into World War I, even as public sentiment leaned toward avoiding involvement. While broader attitudes like isolationism shaped public thinking and non-intervention describes a general stance, the Neutrality Acts are the specific policy tool that codified the United States’ non-entry into foreign wars during the interwar period. Pacifism, meanwhile, is an anti-war ideology rather than a government policy.

Decolonization is the process by which colonies won independence from imperial rule, and it surged after World War II. The war left European powers weakened economically and militarily, making it harder to maintain overseas empires. At the same time, nationalist movements within colonies grew stronger and gained international support for self-rule, especially as the United Nations and global opinion promoted self-determination. This combination of internal push and external legitimacy led many African and Asian territories to shed colonial rule in the 1950s and 1960s. The other options don’t explain the broad shift toward independence after WWII: the Great Recession is an economic crisis years later, Occupy Wall Street is a post-2008 protest movement, and the Iraqi War is a 2003 conflict unrelated to the wave of decolonization that followed WWII.

Nativism describes the belief that native-born Americans should hold political and social dominance, and it often fueled anti-immigrant sentiment in the late 19th century. As waves of newcomers arrived from Europe and Asia, fears about job competition, cultural change, and political influence led native-born residents and some politicians to push for restrictions on immigration and policies that favored those already established. This mindset helped shape laws and public attitudes aimed at limiting newcomers. Americanization is about programs to assimilate immigrants into American culture, not about native-born dominance, so it doesn’t fit as well. Urbanization centers on the growth of cities and doesn’t address attitudes toward immigrants, and racial segregation involves separating people by race rather than the dominance of native-born citizens.

The essential idea is that World War I required a large army quickly, so the United States enacted a formal system of conscription through the Selective Service Act of 1917. This law authorized the registration of men aged roughly 18 to 45 and established a lottery to determine who would be drafted into military service, enabling a rapid buildup for combat in Europe. The Militia Act of 1903 reorganized state militias into the National Guard and increased federal oversight, but it did not create the nationwide draft for WWI. The other names listed aren’t the official title of the WWI conscription law, and there wasn’t a separate act commonly known as a “Draft Act” for this purpose.