FRENCH railway crossings bear warning signs that writers of books about Donald Trump should heed. "One Train Can Hide Another" their neat enamel plaques declare. The risks of Trump-distraction are great, because the 45th president is such a spectacle-a tooting, puffing, brass-and-steam-whistle commotion liable to draw all gazes, all the time. But a narrow focus on the man risks a potentially grave mistake: paying too little attention to large, slow-rolling yet remorseless political forces that were in motion long before Mr Trump chugged into view.
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