I selected 'Not sure'. With a single super power there's no real risk of a massive war, read World War III, but there might be an increased risk of things like terrorism. Any militant opposition to this super power would be(/is?) scattered groups with little to no connection to each other. They're more likely to be terrorists or guerilla soldiers than an conventional army. And as such they don't have to worry about 'mutual destruction' when it comes to nuclear weapons since they, rarely, have a country or population to defend.
A world with only one superpower would only be 'safe' if everyone agreed with it or that it had so much power that no one would dare to oppose it. But that depends on what you mean by 'safe'.
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Nothing is impossible, it's just a matter of probability.
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