Trump has a foreign-policy doctrine, all right. He’s been advancing it with remarkable speed, skill, and consistency. Its effect can be summed up in one neat slogan: Make America Weak Again.
America’s preeminence on the world stage rests on five essential sources of power: neighbors, allies, markets, values, and military might. The Trump Doctrine is weakening all of them except the military.”
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International-relations scholars have long found that great powers typically fall for two reasons: imperial overstretch or rivalry with other great powers. Never in world history has a country declined because of so many self-inflicted attacks on the sources of its own power.