What was a significant action taken by Roosevelt in preparation for war?

The significant action taken by Roosevelt in preparation for war that involved doubling the size of the Navy reflects his understanding of the growing geopolitical tensions in the world during the late 1930s and early 1940s. This decision was part of a broader military buildup aimed at strengthening the United States’ naval capabilities in anticipation of potential conflicts, particularly in light of the aggressive actions taken by Germany and Japan during this period.

Doubling the Navy was a critical step because a strong naval force was essential for both defense and power projection, particularly as the U.S. was becoming more involved in global affairs. This buildup was not just a reaction to immediate threats but also a proactive measure to ensure that the United States would be prepared to protect its interests and allies if conflict arose.

Other options, such as authorizing the construction of new military bases in Europe, establishing a peace treaty with Germany, and negotiating arms treaties with foreign nations, either did not occur or were not significant actions that Roosevelt undertook in the context of preparing for war. Instead, the focus on expanding the Navy demonstrates a clear commitment to military preparedness, which would later prove crucial as the U.S. entered World War II.