The 15th Amendment to the Constitution granted African American men the right to vote by declaring that the "right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude."
Because there are only two senators who must represent a whole state.
The answer I would have to go with would be B. foreign trade was booming
Hope this helps!
Each state has a equal amount senators no matter much the population is of the state so A
A and B are the best answers, I'm 99% sure. Good luck, lovely! <3