Why did the allies decide to concentrate first on war in Europe?

Strategic importance of Europe: The Allies, consisting primarily of the United States, the United Kingdom, and the Soviet Union, prioritized the European theater of World War II for several strategic reasons:

1. Proximity to Allied homelands: The European theater was geographically closer to the Allies' home countries. Defeating Germany and its Axis allies in Europe would reduce the immediate threat to their territories and secure their own national interests.

2. German war machine: Germany, under Adolf Hitler's leadership, posed a significant threat to the Allies. Hitler's aggressive military campaigns and occupation of European countries had to be stopped to ensure the safety of the Allies' interests and the world at large.

3. Threat to Britain: Britain, a crucial Ally, was under direct threat from Nazi Germany. The German air force, the Luftwaffe, conducted a massive bombing campaign against British cities, known as the Battle of Britain. Defeating Germany was essential for Britain's survival and continued involvement in the war effort.

4. Soviet involvement: The Soviet Union, a key Ally, was engaged in a massive conflict with Germany on the Eastern Front. Germany's invasion of the Soviet Union, known as Operation Barbarossa, had resulted in intense fighting and significant casualties. Supporting the Soviet Union in their war against Germany was vital in weakening Germany's military strength.

5. Control of natural resources: Europe was a source of critical natural resources, including coal, steel, and oil, essential for the war effort. Securing control of these resources was crucial for both the Allies and the Axis powers.

6. Geopolitical considerations: Europe was a vital geopolitical region with significant historical, cultural, and economic importance. Controlling Europe meant gaining influence and strategic advantage over the region's political and economic spheres.

7. Ideological differences: The war was also fought over opposing ideologies. The Allies, representing democracy and individual liberty, sought to defeat Nazi Germany, which represented totalitarianism and racial supremacy. Europe was seen as a battleground for these competing ideologies.

In conclusion, the Allies concentrated first on the war in Europe due to its strategic importance in relation to their homelands, the threat posed by Germany, the involvement of the Soviet Union, control of vital resources, geopolitical considerations, and the prevailing ideological differences of the time.