New Hampshire ratifies the Constitution of the United States. Since it is the ninth state, the process of selecting Senators and Representatives begins
(First) Manassas (Confederate)
(First) Bull Run (Union)
About 25 miles southwest of Washington the first major battle of the Civil War pits Irvin McDowell [US] against P. G. T. Beauregard [CS] and Joe Johnston [CS].
In a tersely worded telegram, Braxton Bragg informs Jefferson Davis that he will move his army in force from Tupelo, Mississippi to Chattanooga, Tennessee