Dec 1850–Aug 1851US-Mexican talksfail to resolveborder dispute
17 Sep 1851Treaty of FortLaramie guaranteesUS safe passagealong Oregon Trail
1 Jun–29 Oct 1852Raousset-Boulboninvades Sonora
13 Oct–10 Nov 1852Abortive Federationbetween El Salvador,Honduras & Nicaragua