By treaty with France after the victory in war
Answer:
In the United States of America, opponents of immigration typically focus on perceived adverse effects, such as economic costs (job competition and burdens on education and social services); negative environmental impact from accelerated population growth; increased crime rates, and in the long run
Protecting citizens yes<span>
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Answer: If it's in your opinion, then no. But if it's somebody else's opinion that you don't agree with, then you do have to cite your sources.
I hope that makes sense!