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Use "nation-states" in a sentence
"In a “borderless world,” the idea of nation-states going to war seemed positively antediluvian."
"The rise of nation-states, and the broader adoption of majority languages in them—from France and Kenya and Peru to Russia and China and Japan, as well as the United States and the United Kingdom and many more—have erased or suppressed innumerable minority languages in the modern era."
"We have passed the era of nation-states into the international era."