WI the Three-Province Plan has succeeded?

In OTL, prior to the provincehood of Alberta and Saskatchewan, the Provinces were divided amongst four districts within the Northwest Territories; Alberta, Assiniboia, Athabasca and Saskatchewan. Eventually in 1905, after a variety of proposals, an East/West Division was chosen giving us our modern Provinces.

However, strongly urged by a Saint Albert Judge named Thomas H. Mcguire, was a plan to make the southern three districts of the Territories - Alberta, Assiniboia and Saskatchewan - into Provinces, leaving the Athabasca District apart of the NWT.

800px-Manitoba_and_Northwest_Territories_%281900%29.jpg


What changes might have occurred as a result of this shift, What would the capitals of these provinces be, and what might become of the District of Athabasca? Would it eventually be absorbed by Alberta/Saskatchewan as in OTL, become it's own Province/Territory or just remain apart of the NWT?
 
OTL All those straight lines were drawn by white guys, thousands of miles away who had never visited the prairies. I suspect that the prairie provinces got stuck with all those non-arable forests simply because Ottawa did not want the burden of administering them: roads, railroads, airstrips, medicine, education, police, etc.

ATL The northern border should be drawn diagonally: NW to SE to match the northern border of the prairies. Even today, few people live north of arable land. The only exception is the oil workers in the tar sands of northern Alberta.
 
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