The peace and stability the Mounties brought fostered dreams of mass settlement on the Canadian Prairies. The land was surveyed by the Canadian Pacific Railway for possible routes to the Pacific. The early favourite was a northerly line that went through Edmonton and the Yellowhead Pass. The success of the Mounties in the South, coupled with a government desire to establish Canadian sovereignty of that area, and the CPR's desire to undercut land speculators, prompted the CPR to announce a last minute switch of the route to a more southerly path passing through Calgary and the Kicking Horse Pass. This was against the advice of some surveyors who said that the south was an arid zone not suitable for agricultural settlement.