"(Supporters) argue that consolidation of power in the presidency would help solve the rift that occurred after another constitutional change in 2007 (that allowed direct elections of the president)".
The new system takes effect at the next election, now slated for 2019.
Not only the result will give him new powers as the country's head of state, but will also extend his influence over the judiciary making him dominant over the Parliament.
The European Union statement, issued by Commission President Jean-Claude Juncker and two other top officials, said the EU executive took note of the result and was awaiting an assessment of an worldwide observation mission "also with regard to alleged irregularities".
Turkey voted on Sunday in a referendum on granting President Recep Tayyip Erdogan extra powers that was won by the "Yes" camp but disputed by the opposition.
The pro-Kurdish opposition Peoples' Democratic Party said it presented complaints about unstamped ballots affecting 3 million voters, more than twice the margin of Erdogan's victory.
They have lost the referendum vote but in some sense see the result as a victory given what they say was the vast pressure of the state against them during the campaign.
"This is actually a huge success for the "no" campaign", Tol told ABC News. Opposition parties claim a win for the Yes side was called before all ballots had been counted.
The Organization for Security and Co-operation in Europe (OSCE), an observer mission that has been monitoring the vote on the Turkish referendum, alleged today that the voting process "fell short" of global standards.
Mr Kurz tweeted the result "shows how divided the country is".
Turkey awoke to a new era on Monday.
On the streets of Istanbul jubilant crowds chanted President Erdogan's name on Sunday night, honking vehicle horns and shouting "God is great!".
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The new executive presidency is expected to come into effect following the next presidential election in 2019, and will give Mr Erdogan sweeping powers to appoint ministers, dissolve parliament and enact a state of emergency.
Supporters of Turkish President Tayyip Erdogan celebrate in Istanbul, Turkey, April 16, 2017.
"His core constituency at this point includes many religiously pious voters", Cook said.
The increasing polarization of Turkish society has long anxious observers, who note the dangers of deepening societal divisions in a country with a history of political instability.
"However, this new state of affairs may suit both president Erdogan and European Union leaders", Pierini added.
"I don't see the country is going down a good path", he said, sitting by the Bosporus. "You'll also see increased polarization among the Turkish people".
"Relations with Turkey are no easy ones, but they are unequivocally keynoted by partnership in the economy and politics". He added, however, the measure's approval raises questions about "whether or not Turkey shares common values" with the U.S.
In Istanbul, hundreds of "no" supporters demonstrated in the streets on Monday, chanting "thief, murderer, Erdogan" and banging pots and pans. "I feel much more optimistic about my prospects", he said on the morning after the vote.
The criticism by the European observers went far beyond the voting irregularities, though, and was more broadly critical of the government's conduct in the run-up to the referendum.
"That's the hope", said Jim Jeffrey, who served as the USA ambassador to Turkey from 2008 to 2010 under President Obama. "We took this decision before one single vote was counted and registered into system".
"At the moment, this is a dubious vote", he said.
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