1861, April 12 First guns are fired in Civil War at Union installation at Fort Sumter, South Carolina, over question of southern states' right to secede from the Union.
Jefferson County Idaho (Vacant / Not In Use) has 1 places on the National Register of Historic Places.
Some of the country's most noteable architects helped create the Jefferson County places including Alexander Whitehead. Prominent architectural styles found in Jefferson Country are Colonial Revival.