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Answer:
fought legal reforms to protect their rights and win the right to vote.
The main thing that the AEF, doughboys, and harlem hellfighters (369th regiment), have all in common is that they were part of the "American Expeditionary Forces," who were sent to Europe in 1917.
I think what it's asking is if people (let's just say from Canada) want to become a U.S. citizen should they be allowed to run for president after they become a citizen. Personally I think they shouldn't because if your going to represent a country you should be from that country.
I hope this helped