Which war led to significant changes in U.S. foreign policy and national unity?

The Civil War had a profound impact on U.S. foreign policy and national unity, leading to significant changes that shaped the trajectory of the nation. One of the most notable aspects of this period was the emergence of a stronger centralized federal government, which altered how the United States interacted with other nations and addressed domestic issues.

Before the Civil War, foreign policy was largely driven by a loose interpretation of the Constitution, often emphasizing states' rights. However, the war necessitated a unified national approach to governance, which resulted in the federal government taking a more active role in both internal and external affairs. This transformation laid the groundwork for future U.S. involvement in global matters and international relations.

Furthermore, the outcome of the Civil War reinforced national unity, as the defeat of the Confederacy solidified the principle of a single, indivisible nation. This newfound unity also influenced how the U.S. presented itself to the world, aiming to convey strength and stability. In the years following the war, the U.S. began to navigate complex international dynamics, adopting policies that would eventually lead to increased involvement in global conflicts and diplomacy.

Thus, the Civil War marked a turning point for U.S. foreign policy and national cohesion, setting the stage for the country's evolution into