Map of the United States showing U. S. acquisitions, 1845 to 1848. States shaded in whole or in part are Texas, New Mexico, Colorado, Arizona, Utah, California, Nevada, Oregon, Washington, Idaho, Montana, and Wyoming. The first area, labeled 1844, includes eastern Texas as the Lone Star Republic. The second area, marked 1848, includes west Texas, east New Mexico, central and southeastern Colorado, and marks land in dispute between Texas and Mexico in 1848. The third area, labeled 1853, is the Gadsden Purchase, which is south of Arizona. The fourth area is the Mexican Cession of 1848 Guadalupe Hidalgo, including west New Mexico, west Colorado, Utah, north Arizona, California, and Nevada. The last area, 1846, marks the Oregon Territory Treaty with Great Britain, which includes Oregon, Washington, Idaho, northwest Montana, and western Wyoming. Public Domain

Which of these region(s) on the map were a source of conflict between the U. S. and Great Britain?

Northwest
Southwest and southern west coast
Northwest and southern west coast
Southwest