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Idaho was in land that was contested between the United States and Great Britain. Under President Polk, the treaty of 1846 settled the boundary of the United States and what is now Canada. Idaho became part of Oregon and Washington territories. After Oregon became a state, boundaries were redrawn and in 1859 both parts of Idaho were reunited. In 1863, it became Idaho Territory and then a state in 1890.
Great Britain and the United States both wanted the northwest area that is now Oregon and Washington state. President Polk told Great Britain "54'40" or Fight." There was no fight, there was a compromise.
The area that had its border set at the 49th parallel by President Polk and Britain in 1849 is Oregon.
James Knox Polk as a result of the Mexican American War.
President Polk sent troops to Mexico to seize the Oregon Territory, which began the Mexican War that the U.S. ultimately won to acquire Oregon.
James K. Polk
President James Polk was a democrat and an expansionist, meaning he believed in the expansion of the American border. in fact, one of Polk's slogans was "54 40' or fight", meaning that he would fight in order to get the American Northwestern border extended too the 54 40' latitude. he also wanted the immediate annexation of Texas. Polk also supported and signed the Oregon Treaty with Great Britain, peacefully giving the US Oregon, Washington. and parts of Idaho, Wyoming, and Montana. Additionally, he, unlike much of America, supported the Mexican-American war. Since Polk was a Democrat, and Democrats had a lot of supporters in the South, President Polk was pretty much guaranteed to support slavery as well.
The northern boundary of the Oregon territory was settled by a treaty with Britain while Polk was president. He settled for less that the 54-40 he had campaigned for.
PRESIDENT POLK
Division at the 49th parallel
The area that had its border set at the 49th parallel by President Polk and Britain in 1849 is Oregon.
Polk added over 800,000 square miles to western territory and extended the boundary of the country to the Pacific Ocean. He also lowered tariffs and created an independent federal treasury. He only served one term as promised.