(A) Nuclear technology was developed by the Manhattan Project
(B) National economy expanded due to wartime production
(C) Industrial infrastructure remained undamaged during WWII
(D) ** all of the above
EXPLANATIONS BELOW
Concept note-1: -On December 7, 1941, following the Japanese bombing of Pearl Harbor, the United States declared war on Japan. Three days later, after Germany and Italy declared war on it, the United States became fully engaged in the Second World War.
Concept note-2: -Driven by growing consumer demand, as well as the continuing expansion of the military-industrial complex as the Cold War ramped up, the United States reached new heights of prosperity in the years after World War II.
Concept note-3: -Why did the U.S. enter World War II? The U.S. entered WWII because the Japanese bombed U.S. battleships and airplanes at Pearl Harbor, Hawaii. The U.S. declared war on the Axis powers on December 7, 1941.
Concept note-4: -Virtually all historians of the Second World War agree that Hitler’s rise to power was the proximate cause of the cataclysmic war that gripped the globe between 1939 and 1945.