How did Alberta’s boundaries change when it became a province in 1905?

Before 1905, Alberta existed as a district of the North-West Territories, having been established in 1882. When it was officially granted provincehood in 1905, it was significantly enlarged to reach its current boundaries.123

This expansion involved incorporating territory that had previously been part of the District of Athabaska, which was abolished the same year. By the time of its formation as a province, Alberta’s borders were set to extend north to the 60th parallel, establishing the geographic footprint it maintains today.415