This suggests a choice. The United States could capitalize on the advantages that come with being an open, expanding, innovative country that is increasingly diverse. Or the nation’s leaders could react to the declining demographic dominance of White Americans by fighting a rearguard action against ethnic and cultural change, making the country more like Japan or some Eastern European countries: aging, stagnating and culturally static. This is the desultory future toward which former president Donald Trump tried to drag the country — and that many Republicans, eager to tap into the White anxiety about social change that propelled Mr. Trump, have embraced.
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