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Use "peacefulness" in a sentence
"America's peacefulness is merely a self-serving national myth."
"The rankings show that even among the G8 countries there are significant differences in peacefulness: While Japan was the most peaceful of the G8 countries, at a rank of five in the Index, Russia neared the bottom at number 118."
"Ironically enough its peacefulness is due to war: for if it were not for the artillery practice-ranges which lie behind it, it would long ago have been exploited."