What happened to most of the Mexican people living in the territory Treaty of Guadalupe

The treaty extended U.S. citizenship to Mexicans living in the newly acquired territories, unless they specifically declared their intention to remain Mexicans. Residents had one year to choose whether they wanted American or Mexican citizenship; More than 90 percent chose American citizenship

Explanation:

zoom in on the bill of rights. the other side was just as divided: some antifederalists opposed the constitution only because it lacked a bill of rights, and others opposed it on other grounds and merely used the bill of rights as an excuse to campaign against it.

the answer would be:

b. race