Answer:
to understand
Explanation:
because it need to read first so you can help the reader helping you
Open Door Policy of Secretary John Hay aims to keep China a free trade country with equal trade opportunities between countries. At that time, the European country has colonized nearby Hongkong. Thus, the answer is letter C. Open Door policy had kept European Power to limit foreign trade with China.
The Vietnam War was the mist troubling as Americans did not understand why we were there.
