World War I was called the Great War. People thought that it would be the war to end all wars.
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It ended with the exchange of ratifications of the Treaty of Ghent. In 1812, with President Madison in office, Congress declared war against the British. The war began with an attack on Canada, both as an effort to gain land and to cut off British supply lines to Tecumseh's Indian confederation, which had long troubled the US.
(A) He may have acted alone, although Austria-Hungary thought he was helped along by the Serbian government. ... (C) He was probably assisted by the Serbian government, which hoped that his actions would spark a world war and help Serbia gain independence.
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Portugal and Spain both wanted to control the trade routes with Asia. Spain established colonies, while Portugal only established forts.