By Fareed Zakaria
There has been much focus on Donald Trump’s erratic foreign policy — the outlandish positions, the many flip-flops, the mistakes. But far more damaging in the long run might be what some have termed "the Trump effect" — the impact of Trump on the domestic politics of other countries. That effect appears to be powerful, negative and enduring. It could undermine decades of American foreign policy successes.
Look at Mexico. For decades, this was a country defined by fiery anti-Americanism. Founded by a radical revolutionary movement, fueled by anger against American imperialism and high-handedness, Mexico would rarely cooperate with Washington. Since the 1990s, the landscape has shifted, indeed almost reversed. Thanks to intelligent leadership in Mexico City and consistent bipartisan engagement by Washington, the United States and Mexico have become friendly neighbors, active trading partners and allies in national security.