Well, has a primary source, it’s probably A. person
What impact did many state constitutions have on the separation of church and state affairs?
States could not support an established church.
Answer:
A. It brought about the decline of the Federalist Party.
Explanation:
The effect of the Hartford Convention is which was held between December 1814 to January 1815 was widely known to be based on President James Madison’s mercantile policies and the progress of the War of 1812, including the unacceptable position of the political situation of the country more specifically national government power shifting to South.
However, following the unexpected victory in the Battle of New Orleans, and the secret nature of the Hartford convention, brought about the decline of the Federalist Party.
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".