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<br>"The Monroe Doctrine of 1823 defined United States foreign policy in the Americas for the rest of the 19th century and beyond. It declared that the United States had an interest in the Western Hemisphere and the European powers must not meddle in the affairs of any developing nations there. The United States was a young nation in 1823 and did not really have to powers to back up the Monroe Doctrine. However, the policy was used to justify the sending of the U.S. troops into Mexico in 1866 (to intimidate the French) and the purchased of Alaska in 1867". Another case of Imperialism was the United States industrial economy was growing so fast that they were producing more goods than they could consume. The over abundance of industrial goods led the United States to look for new markets. Next came the Spanish-American War, which started with the Americans not liked the way that the Spaniards were treated the Cubans. After this an U.S. battleship (Maine) was docked outside of Havana (Cuba's Capital) and all of a sudden exploded from under the sea. At the time no one actually knew the real reason why the ship exploded but many Americans thought that it was the Spaniards. 266 officers and men were lost in the