Sturgeon took to the stage to rapturous applause, and reaffirmed a statement she made on Friday that she would request an independence referendum from whoever is in Number 10 by Christmas.
The event, which was staged by the pro-independence newspaper The National, was the first such rally that Ms Sturgeon has addressed since the referendum campaign of 2014.
Asked about the lack of support from Westminster parties for a second independence referendum, she said the position was "unsustainable" and that "a better alternative is to choose our own future, where we can build the type of country we want to be".
"The future of our country is on the line, and there is no doubt whatsoever that Scotland stands at the crossroads".
And instead, she said: "There is a much better alternative".
Speaking ahead of the rally, he said: "The cause of Scottish independence must be broad and inclusive".
Johnson. Farage. Trump. Three names that sum up the times we find ourselves living in - and three names who should provide more than enough motivation for people across Scotland to come out and make clear that their values are not our values.
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"It's a Labour government that will do that".
'An independent Scotland is closer than it has ever been.
"We can't make a trade deal with the United Kingdom because I think we can do many times the numbers that we're doing right now and certainly much bigger numbers than you are doing under the European Union". "So with this column I'm leaving the Conservative party".
Independence is now "within touching distance", the politician will tell a pro-SNP rally in Glasgow's George Square.
"To invest in our people, and invest in our public services, and invest in lifting children out of poverty, not in a hard Brexit, not in Trident weapons of mass destruction on the River Clyde".
"We secured more votes than both Labour and the Conservatives in the European elections earlier this year and have enjoyed fantastic local and by-election successes across the country".
"Let us inspire people with the positive message of everything an independent Scotland can be and everything the people of Scotland have it in themselves to achieve".
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"We must come out in numbers and vote in this election to escape the chaos and misery of Brexit, vote to put Scotland's future in Scotland's hands".
This election really is the most important one Scotland has faced in modern times.
The Tories criticised Nicola Sturgeon for prioritising indyref2 "above all else".
Patrick Harvie directed his attack towards Tory frontbenchers Jacob Rees-Mogg and Boris Johnson specifically, calling them "expensively educated idiots" as well as declaring Scottish independence to be "inevitable".
Scottish Labour leader Richard Leonard said: "Nicola Sturgeon has launched a wave of attacks against the Labour Party as she knows we are her biggest threat in this election".
"So this election is about stopping Nicola Sturgeon from dividing our communities all over again, and only a vote for the Scottish Conservatives will do that".
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We can't get the ball around enough and we're going to trade you to the Jets , '" Thomas said. "And that was that". At my position and what I do, it was affecting me cutting and changing direction, and I do that every single play.