The two events that affected both the United States and Canada are:
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The War of 1812 - This conflict involved the United States and British forces, including troops from Canada, which was a British colony at the time. The war had significant impacts on both countries.
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The Great Depression - This global economic downturn affected both the United States and Canada, leading to widespread economic struggles and social unrest in both nations.
The other events listed primarily impacted the United States or Canada individually rather than both simultaneously.