28 Feb 1861Colorado Territorycreated, replacingunsanctionedJefferson Territory
2 Mar 1861Dakota Territorycreated
2 Mar 1861Nevada Territorycreated
2 Mar 1861Texas joinsConfederacy
4 Mar 1861Abraham Lincolninaugurated asUS President
18 Mar 1861On request,Spain annexesDominican Rep.
12–13 Apr 1861ConfederatescaptureFort Sumter