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Britain and Germany both signed the treaty
"<span>a. the size of their military" would be the best option from the list, since they greatly outnumbered the colonists and their militias. They were also far-better trained as soldiers. </span>
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".