It would be the Federal Trade Commission of 1914 that <span>strengthened previous corporation control laws and made illegal certain methods big business used to eliminate competition, since it had become clear that previous efforts were not working. </span>
I wanna say its D but i'm not fully sure
It allowed for trade with natives, increasing profits on a new front. New products not yet seen allowed for an increase in sale and demand. Taxing the citizens there also was a boost in government income as well.
Hope this helps