With 99.45% of ballots counted, the "Yes" campaign had won 51.37% and "No" 48.63%, and the electoral board called victory for "Yes".
Erdogan supporters say replacing the parliamentary system with an executive presidency will modernise the country.
Turkey's two main opposition parties said they would challenge the results.
The Republican People's Party (CHP) demanded a recount of 60% of votes. They criticised a decision to accept unstamped ballot papers as valid unless proven otherwise.

Many Turks already fear growing authoritarianism in their country, where tens of thousands of people have been arrested, and at least 100,000 sacked or suspended from their jobs, since a coup attempt last July.
The campaign unfolded under a state of emergency imposed in the wake of the failed coup.

Mr Erdogan assumed the presidency, meant to be a largely ceremonial position, in 2014 after more than a decade as prime minister.

pacino wrote:a bunch of charter school proponents were hired to work under DeVos

“You know, nobody’s got to use the internet…. I don’t think it’s my job to tell you that you cannot get advertising through your information being sold. My job, I think, is to tell you that you have the opportunity to do it and then you take it upon yourself to make the choice….”

So much of this is new to Mr. Trump that only after he publicly accused Mr. Obama of having wiretapped his telephones last year did he ask aides how the system of obtaining eavesdropping warrants from a special foreign intelligence court worked.

The Export-Import Bank, which helps finance purchases of American exports, is a telling example. During the campaign, Mr. Trump sided with conservatives who wanted to eliminate it because the government should not finance large corporations and effectively pick winners and losers in a free-market economy. But on Wednesday, Mr. Trump embraced the bank.

“I was very much opposed to Ex-Im Bank because I said what do we need that for IBM and General Electric,” he told The Wall Street Journal. “It turns out that, first of all, lots of small companies will really be helped, the vendor companies. But also maybe more importantly, other countries give” such aid, and so “we lose a tremendous amount of business.”

“After listening for 10 minutes, I realized that it’s not so easy,” Mr. Trump said. “You know, I felt pretty strongly that they had a tremendous power over” North Korea, he added. “But it’s not what you would think.”

The Export-Import Bank, which helps finance purchases of American exports, is a telling example.

@realDonaldTrump 7m7 minutes ago
The super Liberal Democrat in the Georgia Congressioal race tomorrow wants to protect criminals, allow illegal immigration and raise taxes!

Donald J. Trump‏Verified account @realDonaldTrump 1h1 hour ago
The Fake Media (not Real Media) has gotten even worse since the election. Every story is badly slanted. We have to hold them to the truth!

Donald J. Trump‏Verified account @realDonaldTrump 1h1 hour ago
A great book for your reading enjoyment: "REASONS TO VOTE FOR DEMOCRATS" by Michael J. Knowles.

Donald J. Trump‏Verified account @realDonaldTrump 2h2 hours ago
"The first 90 days of my presidency has exposed the total failure of the last eight years of foreign policy!" So true. @foxandfriends

But flip through a few chapters and you'll quickly notice that all 266 pages — wait for it — are completely blank.

Get it? There ARE no reasons to vote for Democrats — ba dum tss!

pacino wrote:our president:

So much of this is new to Mr. Trump that only after he publicly accused Mr. Obama of having wiretapped his telephones last year did he ask aides how the system of obtaining eavesdropping warrants from a special foreign intelligence court worked.

The Export-Import Bank, which helps finance purchases of American exports, is a telling example. During the campaign, Mr. Trump sided with conservatives who wanted to eliminate it because the government should not finance large corporations and effectively pick winners and losers in a free-market economy. But on Wednesday, Mr. Trump embraced the bank.

“I was very much opposed to Ex-Im Bank because I said what do we need that for IBM and General Electric,” he told The Wall Street Journal. “It turns out that, first of all, lots of small companies will really be helped, the vendor companies. But also maybe more importantly, other countries give” such aid, and so “we lose a tremendous amount of business.”

“After listening for 10 minutes, I realized that it’s not so easy,” Mr. Trump said. “You know, I felt pretty strongly that they had a tremendous power over” North Korea, he added. “But it’s not what you would think.”

Who knew?!

pacino wrote:

Donald J. Trump‏Verified account @realDonaldTrump 1h1 hour ago
A great book for your reading enjoyment: "REASONS TO VOTE FOR DEMOCRATS" by Michael J. Knowles.

also, he's spent 2 hours this morning watching cable news.

the book is just some anti-democrats book:

But flip through a few chapters and you'll quickly notice that all 266 pages — wait for it — are completely blank.

Get it? There ARE no reasons to vote for Democrats — ba dum tss!

Trump has now spent 18 days at a golf course since becoming president 13 weeks ago, which is 18 times more than Obama had played at the same point in his presidency.

Donald J. Trump
✔
@realDonaldTrump

I did what was an almost an impossible thing to do for a Republican-easily won the Electoral College! Now Tax Returns are brought up again?

Donald J. Trump
✔
@realDonaldTrump

Someone should look into who paid for the small organized rallies yesterday. The election is over!

A survey conducted by the state-run pollster VTsIOM released Monday found that 39 percent of Russians hold a negative opinion of Trump, versus only 7 percent in March