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In 1967, William Seward arranged for the United States to purchase Alaska. In 1898, Hawaii is claimed as U.S. territory.
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The United States declared war on Spain after many people believed Spain bombed an American ship.
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When McKinley was assassinated, Theodore Roosevelt became president. Many other events, such as the building of Panama Canal, contributed to America's power.
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The assassination of Franz Ferdinand was the main event that started World War 1.
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The U.S. changed their transportation methods to make the transportation of men and supplies more efficient.
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The Russian Civil War resulted in a communist state.