The correct answer is option D. " It limited the ports for American trade in China". The system of spheres of influence is the phenomenon of one or more Nations intervening in the affairs of others countries. In this case European countries limited the ports for United States trade in China, in an effort to limite America and China expansion.
Answer:
D. It limited the ports for American trade in China.
Explanation:
A system of spheres refers to an area in which an outside power claims exclusive investment or trading privileges within another nation. Therefore, since Europeans wanted to control trading zones, the US created the Open Door Policy to gain equal trade rights for commerce in China .
