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The U.S had to be in war with a foreign country or government, or have experienced an invasion. Then Male citizens 14 or older
in the hostile nation can be deported or imprisoned. -
Congress passed a new immigration act that stated a 50 cent tax would be levied on all aliens landing in U.S ports. People who appeared to be in danger to the U.S were not let into our land.
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The U.S did not want a lot of Chinese people in the U.S. So, if anyone brought in Chinese people they would be fined $500 for every head.
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Any American Diplomat or officer that had a reason to believe that an alien was trying to enter our land can deny their visa.
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Physical boarders between the American and Mexico lines.