The USA used threats and promises to get Britain to agree that the USA should take whatever land they wanted.
Though they had purchased only two islands off the coast of Canada, they took all the land needed to block the Yukons access to the ocean and taunted Canada to respond.
Canada, particularly Ontario and Quebec, did not feel it worth defending their western province and allowed the USA to take land that was rightfully British Columbia's.
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Charles 1
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The Mason-Dixon Line. Surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon in the resolution of a border dispute between British colonies in Colonial America. It forms a demarcation line between four U.S. states, forming part of the borders of Pennsylvania, Maryland, Delaware, and West Virginia (then part of Virginia).
Many people claim that the Kashmir dispute is the unfinished agenda of the partition plan. By this they imply that the solution of the Kashmir dispute should be looked in the light of two nations theory under which India was partitioned; or in the light of the UN Resolutions which deny the Kashmir people the right to determine their own future.
Leaders knew that if they declared war, their allies had to join the fight with them.