The Columbian Exchange involved which of the following new connections in the era 1450–1750?

i think it is the byzantine empire

(b) britain had a much larger navy than the u.s.

(d) the u.s. had a small army compared to britain.

the american civil war was not caused   by slavery but by economic factors.

i liked the part where, i got to pick which statements fitted the questions. i didn't really like doing all the hard work.