Why Trump’s economic disruption will be hard to reverse

President Donald Trump has made clear his intent to smash the reigning global economic order. And in 100 days, he has made remarkable progress in accomplishing that goal. Trump has provoked a trade war, scrapped treaties and suggested that Washington might not defend Europe. He is also dismantling the governmental infrastructure that has provided the know-how and experience.

The changes have been deep. But the world is still churning. Midterm elections in two years could erode the Republican majority in Congress. And Trump’s reign is constitutionally…