Answer + Explanation:
Before World War II, the policy of aggressive expansion was practiced by several nations, including Germany under Hitler, Italy under Mussolini, and Japan under its militarist regime. These nations sought to expand their territories, often by invading and occupying neighboring countries, in order to build empires and increase their economic and military power. The aggressive expansion by these nations, along with their disregard for the principles of international law and the rights of other nations, contributed to the rising tensions and ultimately led to the outbreak of World War II.