Political and economic helped both of their parties to gain support
The answer is B, established a free trade zone with Mexico
What happened after the collapse of the Ming Dynasty were:
1) there were natural disasters, war and rebellions.
2) earthquakes.
3) war against the Japanese.
4) unusually dry and cold weather.
5) plague
6) misrule
7) money crisis
8) rebellion from Li Zicheng's troops.
Chester Alan Arthur is the answer
