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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The results of the Puritan and Glorious Revolutions in England were significant for Europe and the Americas because they demonstrated that Government power was limited by law.
Gaining control of Paris and forcing a change in the monarchy.
Fine soil found on the bottom of rivers is called silt.
