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".
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What led to the outbreak of the bloodiest conflict in the history of North America? A common explanation is that the Civil War was fought over the moral issue of slavery. In fact, it was the economics of slavery and political control of that system that was central to the conflict.
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The presidency of Nelson Mandela began on 10 May 1994, when Nelson Mandela, an anti-apartheid activist, lawyer, and former political prisoner, was inaugurated as President of South Africa, and ended on 14 June 1999.
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