What problem did sir John A. Macdonald fix?

Sir John A. Macdonald, as Canada's first Prime Minister, played a pivotal role in unifying the provinces and territories into a single nation through the Confederation of 1867. He addressed the issue of regional disparities and political fragmentation, creating a more stable and centralized government. Additionally, he focused on developing the country’s infrastructure, notably through the construction of the Canadian Pacific Railway, which helped connect eastern and western Canada and facilitated trade and settlement.