What was a significant effect of WWII on American public sentiment?

The significant effect of World War II on American public sentiment was heightened national morale. The war united the American population under a shared purpose, which was to support the Allied cause and defeat the Axis powers. This collective effort led to a sense of patriotism and resilience among Americans, as they rallied to support the war effort through various means, including enlistment, war production, and civil defense initiatives.

During the war, there was a strong portrayal of American values, such as freedom and democracy, being directly challenged by the actions of Axis powers. This sentiment resonated deeply with the population, fostering a sense of national pride. The successful military campaigns and eventual victory further bolstered morale and created a belief in American exceptionalism, laying the groundwork for the post-war era of prosperity and influence on the global stage.

The other options reflect sentiments or trends that were either not significantly felt or were largely contrary to the prevailing attitudes during and immediately after WWII. Increased isolationism, for instance, would contrast with the involvement and engagement that Americans felt during the war, while decreased recruitment numbers and widespread anti-war protests emerged later in the context of other conflicts, particularly in Vietnam, rather than being characteristic of the WWII era.