In the spring of 1846, the United States was still battling England over boundaries. At issue was the northern boundary of Oregon. The more radical of the Democrats were adament that the boundary extend up to Alaska, at 54 degrees, 40'. Other democrats such as John C. Calhoun, were satisfied with the expansion through the Texas annexation. The Whigs, for the most part, were concerned with avoiding war with England, and refrained from demanding all of Oregon.
In the end, the boundary was set at the forty-ninth parallel during a closed session of the Senate in June.