jun 15, 1846 - The Oregon Treaty
Description:
With Britain.The Treaty of 1818 set the boundary between the United States and British North America along the 49th parallel of north latitude from Minnesota to the "Stony Mountains"
Satisfied expansionist's ambitions and migrants already settled there (steady stream in the 1840s) but northern boundary = 49th parallel (northerners interpreted abandon of American claims to "all oregon" as an indication that Polk favored southern slaveholding interests).
Added to timeline:
Date:
jun 15, 1846
Now
~ 180 years ago