U-boats were military submarines used by the Germans. While they were useful against warships, U-boats were the most effective in economic warfare by blockading coasts so resources could not be shipped to Germany's allies. WWI was the first major war that employed submarines in warfare.
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Reform efforts during this time gave birth to a number of important changes in the United States and Great Britain. These included mandatory public education, child labor laws, and eight-hour workdays. Reforms also addressed minimum wage, compensation for workplace accidents, and improved sanitation infrastructure.
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Poverty, famine, shortage of land, lack of jobs, religious or political persecution, and a spirit of rebellion.
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Nullification Crisis was caused by the introduction of a series of protective tariffs. ... The 1828 Tariff of Abominations which sparked the Nullification Crisis was the third protective tariff implemented by the government.
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tariffs null
