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Many empires grew mostly by conquering land neighbors and are called land empires. Sea empires grew mostly by sailing to distant places and conquering them. The Aztec Empire and the Mongol Empire were land empires. The Venetian Empire and the British Empire were sea empires. The largest empire was The British Empire
Before Christopher Columbus, there were several American empires including Vikings (owned Greenland), the Aztec Empire, and the Inca Empire. The Spanish and the Portugese were the first Europeans to discover America. Later came the English, later to be called the British Empire controlled most of North America, and the Spanish Empire controlled most of South America and Latin America.