EDINBURGH, Scotland (AP) -- Scottish voters have resoundingly rejected independence, deciding to remain part of the United Kingdom after a historic referendum that shook the country to its core.

The decision prevented a rupture of a 307-year union with England, bringing a huge sigh of relief to Britain's economic and political establishment, including Prime Minister David Cameron, who faced calls for his resignation if Scotland had broken away.

The vote on Thursday - 55 percent against independence to 45 percent in favor - saw an unprecedented turnout of just under 85 percent.

"We have chosen unity over division," Alistair Darling, head of the No campaign, said early Friday in Glasgow. "Today is a momentous day for Scotland and the United Kingdom as a whole."

Independence leader Alex Salmond's impassioned plea to launch a new nation fell short, with Scots choosing instead the security of remaining in union with England, Wales and Northern Ireland. Still, the result sets up a whole new political dynamic in the United Kingdom, with Cameron appearing outside No. 10 Downing Street to pledge more powers for regional governments.

A much-relieved Cameron promised to live up to earlier promises to give Scotland new powers on taxes, spending and welfare. He said the new plans will be agreed upon by November, with draft legislation by January.

But he also said change was coming to other parts of the country amid the watershed vote.

"Just as the people of Scotland will have more power over their affairs, so it follows that the people of England, Wales and Northern Ireland must have a bigger say over theirs," Cameron said. "The rights of these voters need to be respected, preserved and enhanced as well."

Many saw it as a "heads versus hearts" campaign, with cautious older Scots concluding that independence would be too risky financially, while younger ones were enamored with the idea of building their own country.

The result saved Cameron from a historic defeat and also helped opposition chief Ed Miliband by keeping his many Labour Party lawmakers in Scotland in place. Labour would have found it much harder to win a national election in 2015 without that support from Scotland.

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The vote against independence keeps the United Kingdom from losing a substantial part of its territory and oil reserves and prevents it from having to find a new base for its nuclear arsenal, now housed in Scotland. It had also faced a possible loss of influence within international institutions including the 28-nation European Union, NATO and the United Nations.

The decision also means Britain can avoid a prolonged period of financial insecurity that had been predicted by some if Scotland broke away.

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