The answer would be: Roosevelt felt that Germany was more of a threat than Japan.
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The correct answer to this question would be alternative D) "Roosevelt believed Hitler and Germany were the more dangerous enemy and so had to be defeated first."
The Allied forces focused on Europe first, and dealt with the threat in the Pacific afterwards. The main reason was that two allied capitals (London and Moscow) could be directly threatened by Germany, while Japan could not directly threaten any capitals.
The United Kingdom was the most vulnerable to attacks from Germany, as they had already taken most countries in Western Europe. It was also believed that if Germany was defeated, Italy and Japan would be weakened and might step back. Despite the attack on Pearl Harbor, the United States stuck to the "Europe First" policy.
The US committed most of her resources to the European Front, because the US followed the "Europe First!" Strategy, in which they defeated the stronger nation Germany and it's European Allies, before focusing on the Pacific Front. This is because many of America's allies generally were on the European side, and Germany had a better economy, army, generals, and technology, compared to Japan, making it so that a greater percentage of resources are needed to defeat Germany. Japan, on the other hand, did not build up much except for the navy, and so the Allies were able to fight a defensive war until Germany was defeated, before using the rest of their resources to defeat Japan.
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