One hundred years ago this month, U.S. President Woodrow Wilson was agonizing over whether to enter World War I. Just a few months earlier, Wilson had won re-election partly by campaigning on a policy of neutrality, which he was now preparing to abandon, along with the slogan ‘America first.’ But now, for the first time in more than 80 years, a U.S. president has taken it up again, to promote a foreign-policy stance that directly controverts the doctrine Wilson embraced.

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