The referendum on Scottish independence will take place on Sept. 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom.
Scottish Readies for Referendum on Independence
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
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Placards showing "Yes" and "No" are displayed on moorland on the Isle of Lewis, in the Outer Hebrides of Scotland, Sept. 14, 2014.

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Scotland's First Minister Alex Salmond holds a T-shirt promoting a concert being held in support of a "Yes" vote, in Edinburgh, Scotland, Sept. 14, 2014.

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Alistair Darling, the leader of the campaign to keep Scotland part of the United Kingdom, waits before a meeting in Edinburgh, Scotland, Sept. 14, 2014.

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A postal vote for the Scottish Independence Referendum is dropped into a letter box in Moulin, Scotland, Sept. 12, 2014.