On the eve of Scotland's historic referendum, opinion polls on Wednesday showed support for staying within the United Kingdom marginally stronger than backing independence, but tens of thousands of undecided citizens agonized over which way to vote.

Leaders and supporters of both sides took to the streets for a final day of campaigning in a country gripped by excitement and hope, balanced by a good measure of dread and concern.

Voters will be asked on Thursday to answer "Yes" or "No" to the question: "Should Scotland be an independent country?"