This week marks the centenary of America’s entry into World War I, when Woodrow Wilson vowed that “the world must be made safe for democracy.” He and his fellow statesmen failed to do so in their day. We are failing in ours.

Snapshots from a week in the news: In Russia, opposition leader Alexei Navalny is in jail for leading last month’s anticorruption protests. In Venezuela, the Supreme Court stepped back from seizing the powers of the legislature but handed President Nicolás Maduro broad control over the country’s oil revenues....