Okay kiddo, let's talk about the Oregon Boundary Dispute.
A long time ago in the 1800s, there were two countries, the United States (where we live) and Great Britain, and they both wanted control over a big area in the Northwestern part of North America.
This area is now known as the states of Oregon, Washington, Idaho, and parts of Montana and Wyoming. Both countries thought they should have control over this land because they had explored it and settled there.
But they couldn't agree on where the boundary line should be between their two countries. The U.S. wanted the border at latitude 54°40′N all the way up to Alaska, while Great Britain wanted the border to be farther south.
For a long time, both countries argued about this issue, and it almost led to a war. However, in 1846, they agreed to a compromise, known as the Oregon Treaty.
This treaty established the current border between the U.S. and Canada, with the U.S. taking the southern part of the disputed territory, and Great Britain taking the northern part.
So, that's the story of the Oregon Boundary Dispute, a disagreement between two countries over land that was finally resolved with a treaty.