Modern notions of race emerged only after Africans of were mixed together in the slave trade and as
Europeans began enslaving Africans and Native Americans
exclusively.
different ethnic groups
similar ethnic groups
B
labor groups
O married groups

different ethnic groups

Explanation:

Modern notions of race emerged only after Africans of different ethnic groups were mixed together in the slave trade and as  Europeans began enslaving Africans and Native Americans  exclusively.

Africa comprises of more than 3,000 different tribes with a lot of them speaking different languages and practicing a unique culture. When the Europeans reached sub-Saharan Africa and began to enslave Africans, once they transported them to the Americas, they considered them as one people.

In grouping them with Native Americans and enslaving both groups exclusively, they began to make slavery a thing of race where the "lower" races were the ones to be enslaved even though slavery had traditionally been practiced on any race.

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

i really do want to but i just don't know it i'm so sorry : (