Why did Prime Minister Borden break his promise that Canadians would never be conscripted?

Prime Minister Borden broke his promise against conscription due to the escalating demands of World War I and the significant loss of Canadian soldiers on the battlefield. As volunteer enlistment numbers dwindled and the need for troops intensified, Borden believed conscription was necessary to ensure Canada could fulfill its commitments to the war effort. The decision was also influenced by pressure from military leaders and the realization that voluntary recruitment alone would not suffice to meet the demands of the conflict. Ultimately, this led to the passing of the Military Service Act in 1917, which implemented conscription.