Answer:LOUISIANA PURCHASE. ... In 1803 he agreed to sell the Louisiana Territory (approximately 827,000 square miles) to the United States for a price of $15 million. The United States doubled its territorial size and extended public lands westward into the Missouri River and the Rocky Mountains.
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Second Sino-Japanese War, (1937–45), conflict that broke out when China began a full-scale resistance to the expansion of Japanese influence in its territory (which had begun in 1931).
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3. They invaded countries to create empires.
It began with the overthrow of the Roman monarchy, c. 509 BC, and lasted over 450 years until its subversion in 29 BC, through a series of civil wars, into the Principate form of government and the Imperial period.