On April 6, 1776, the Continental Congress opened all U.S. ports to international trade with any part of the world not under British rule. Under Britain’s mercantilist policies, all American imports and exports had to pass through Great Britain on their way to and from the colonies.
On April 6, 1862, the Battle of Shiloh began in Tennessee.
On April 6, 1929, Governor Huey P. Long was impeached by the Louisiana House of Representatives. But the Senate needed a two-thirds majority to convict and, when a number of state senators pledged not to vote against Long no matter the evidence, the drive to remove Long was suspended.