How did the concept of "race" develop by the mid-nineteenth century? How did it enter into the manifest destiny debate?

Some people believed that the successful expansion achieved in the past was evidence of "Anglo-Saxon race" superiority. Race in the mid-nineteenth century involved color, culture, origin, class, and religion. Some people feared expansion and total annexation because they did not believe the United States could assimilate so many non-white and Catholic people who were supposedly unfit for citizenship.

Explanation:

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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