Sunday’s election represented one of the biggest threats to Erdoğan’s rule so far. He is Turkey’s most imperious leader since Mustafa Kemal Atatürk, who founded the country 100 years ago — and he won, by 52 percent to 48 percent, with a campaign that reinforced his authoritarian creed.

The question now facing Turkey — and the wider world — is what the leader will do next.

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