It marked the end of Greece's Golden Age.
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The primary reason it was so important was it was the first time someone had come up with an inexpensive way to manufacture mass quantities of steel.
Britain and The United States were allies. They wanted to end the war (World War 1). Wilson saw Germany's actions as an act of war and thus ended the Isolation Policy.
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Muslim nations are overcrowded, causing immigration to Europe.
Explanation: