President Abraham Lincoln submits his first annual message to Congress, in which he describes the current state of affairs and reiterates his view that the Union must be preserved by all necessary means.
The second session of the first Republican-dominated Congress opened with many intent on destroying slavery as a means to win the war.
The U.S. Congress approves legislation to pay for the war, including the first-ever personal income tax.
The U.S. Congress defiantly resolves that the defeat at Bull Run will not stop the Federals from achieving ultimate victory.
The U.S. Congress begins debating on how to pay for the war, while the anti-war minority makes its voice heard.
The 37th Congress of the United States assembles in special session as called by President Abraham Lincoln.