I would try to gain an understanding of the circumstances that led to their negative opinions, and I would try to make them understand where I am coming from with respect to my recommendation. Such a sincere exchange often reveals information that was previously unknown by some.
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Nativists
He eventually opposed all slavery. People would treat African slaves better.
Increased amounts of immigration
Philippine annexation would be peaceful if nobody resisted. THEY WERE OPPOSED BECAUSE THEY WANTED TO RULE THEMSELVES.
Northerners opposed Missouri's entrance as a slave state because slave states would have more senators in Congress than the free states would. It would give the South a bigger voting presence in Congress. This issue was the basic cause of the Civil War.