Limiting contact with foreigners was the main goal of chinese
corruption.
isolationism.
kowtowing.
missionaries.

The correct option is "isolationism"

Isolationism is a concept that is used preferentially in state politics to designate a political inclination that defends the isolation, isolation and nonintervention of this or that country in international conjunctural issues. That is, putting it in simpler terms, isolationism proposes that a country does not intervene in any way in an external conflict that afflicts another nation or group of nations so that it does not end up affecting their interests.

It should be noted that this is a political trend that has been assumed by several nations at various times in history, from China, through England and even the United States have played a leading role at some point in its political history.

b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do