Answer: there are no options to choose from
Explanation:
The answer is D. Nixon resigned
I think that the best answer is the geographic location: many other countries (Sweden for example) have tried being neutral at different times but did not manage to: but the fact that the US has only two boundaries, and that both other countries also have a history of fighting from independence from a European power, makes it possible that unless US decideds to get involved in international politics, it can be "left alone".
This impacted the power of the roman catholic church by calling the people to pray, aswell as organizing religious trecks and creating a petition to stop the pestilence