Several sources of labor were tried before african slavery became popular in the american south. which of the following was one of the main reasons for the popularity of african slavery?

using convict labor was seen as an immoral, uncivilized practice.
white people could not withstand working in the hot southern climate.
the cost of a white man's labor for 10 years could buy an african for life.
there were not enough native americans for the amount of work to be done.

The only reason why African slavery was so popular is that The cost of a white man's labor for 10 years could buy an African for life, so it's the third option represented above. There was no lack of native people or moral issues,so the price, which was established, lead to such situation.

From mexican american war , us gained new mexico.

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