The election was the first to be held since Turkish voters narrowly approved a referendum last year to give the president — once a largely ceremonial role — sweeping executive powers. Mr. Erdogan will also have a pliant Parliament, with his conservative party and its allies having won about 53 percent of the vote in legislative elections on Sunday.
Mr. Erdogan has overseen a crackdown on lawyers, judges, civil servants and journalists under a state of emergency declared after a failed coup two years ago. His critics had portrayed Sunday’s election as their last chance to prevent Turkey from becoming an authoritarian state.
The victory has potentially grave consequences for cooperation within NATO, security in Iraq and Syria, and control of immigration flows into Europe.
Turkey has continued to cooperate with its Western partners on counterterrorism efforts, but Mr. Erdogan has tested the NATO alliance by drawing closer to President Vladimir V. Putin of Russia, buying an advanced Russian missile defense system and planning a Russian-built nuclear reactor in Turkey.
As in other countries where strongmen have gained at the ballot box, many Turkish voters appeared to have accepted Mr. Erdogan’s argument that powerful centralized authority was essential to forge a strong state and guard against the threat of terrorism.
The results released by the official Anadolu news agency showed Mr. Erdogan with just under 53 percent of the vote, enough to spare him from a runoff against his leading challenger, Muharrem Ince, who won nearly 31 percent.
At 10:30 p.m., Mr. Erdogan, 64, gave a short televised speech to applauding supporters at the gates of Huber Pavilion, one of his residences in Istanbul. carlotta gall new york times