What major event in 1867 significantly shaped Canada's political landscape?

The major event in 1867 that significantly shaped Canada's political landscape was Confederation. This event marked the union of the British North American colonies into a single Dominion called Canada, initially comprising Ontario, Quebec, New Brunswick, and Nova Scotia. Confederation was crucial because it established Canada as a self-governing entity within the British Empire, laying the foundation for its future growth as a nation.

It allowed for the creation of a federal system of government that balanced power between a central authority and provinces, which continues to influence Canadian politics today. This period is recognized as the beginning of Canada's journey toward complete independence, shaping its national identity and governance structure.

The other events listed do not pertain to Canada’s political foundation in the same significant way. The signing of the Treaty of Versailles was about the end of World War I and involved European powers rather than Canada specifically. World War I, while impactful, occurred later and was more about international conflict than the internal structuring of Canada. The creation of the United Nations arose after World War II and focused on global governance rather than Canadian domestic affairs. Thus, none of those events have the same profound effect on the political framework of Canada as Confederation did in 1867.