Alaska - Not for sale?

Alaska for the USA was a huge bargain,but why did the USA just leave it as that? I could have seen Alaska slightly bigger to include the Yukon territory of Canada at the most,because then..as now..that portion of Canada isn't that populated.

But the Yukon was definately Canada (or rather British via the North-Western Territory) and had been claimed as such for over a hundred years at the time of the Purchase. It wasn't Russias to sell or Americas to claim unless they wanted a war...
 
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