Slavery would’ve probably been around a lot longer
Answer:
The U.S. entered World War I because Germany embarked on a deadly gamble. Germany sank many American merchant ships around the British Isles which prompted the American entry into the war.
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Shah Reza Pahlavi was a brutal dictator, but his departure did not mean Iran was more free. The Shah was pro-west, and would brutally crack down on any dissent. He was replaced by Ayatollah Khomeini, who helped to install a religous dictatorship in Iran. Everything that the Shah had stood for --- including the western world --- was now seen with open contempt by the government.
Now what you want to do is you want to hook your reader like Gun violence is a problem in our society today that should instantly hook your reader.