Can someone give me 3 points about why the route of the Canadian Pacific Railway(CRP) was moved south in 1880?

I already know that it was moved south because
1)That way the americans would not claim the land as their own
2)The company that was building the railway would have to buy a lot of land if it went though the Red River settlement(idk if it`s the RRS, is it?or was it another settlement?)

Canadian Pacific was given government land grants along the line they built. It is easier to build a rail line across the southern section of western Canada than to the north. Prairie landscape does not go all the way from the 49th Palallel to the Arctic Circle. To the north there are rolling hills. Also, it was easier to build a line through the southern Canadian Rockies than to the north. Canadian Pacific travels through at Banff. Canadian National traverses at Jasper.

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