EMPIRE BUILDING Germany, Italy, and Japan tried to build empires. They began their expansion by conquering other nations and dominating them politically and economically.
SCIENCE AND TECHNOLOGY Far-reaching developments in science and technology changed the course of World War II. Improvements in aircraft, tanks, and submarines and the development of radar and the atomic bomb drastically altered the way wars were fought.
ECONOMICS Fighting the Axis terror weakened the economies of Great Britain, the Soviet Union, and other European countries. In contrast, when the United States entered the war, its economy grew sharply. The strength of the American economy bolstered the Allied war effort.