Your teacher is not includeing Alberta, it is also concidered the foothills of the Rockies. At the boarder of Saskatchewan and Alberta the flat lands stop and the rolling hills start. This is where the cattle ranches start to be more prominent. This could be her reasoning.
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There are three prairie Provinces:
Manitoba
Saskatchewan
Alberta
Your teacher is not includeing Alberta, it is also concidered the foothills of the Rockies. At the boarder of Saskatchewan and Alberta the flat lands stop and the rolling hills start. This is where the cattle ranches start to be more prominent. This could be her reasoning.