Here ya' go JDog...
Tradition tells of a chime that changed the world on July 8, 1776, with the Liberty Bell ringing out from the tower of Independence Hall summoning citizens to hear the first public reading of the Declaration of Independence by Colonel John Nixon.
The Pennsylvania Assembly ordered the Bell in 1751 to commemorate the 50-year anniversary of William Penn's 1701 Charter of Privileges.
The bell arrived in Philadelphia on September 1, 1752, but was not hung until March 10, 1753, on which day Isaac Norris wrote, "I had the mortification to hear that it was cracked by a stroke of the clapper without any other viollence [sic] as it was hung up to try the sound."
The cause of the break is thought to have been attributable either to flaws in its casting or, as they thought at the time, to its being too brittle.
There is widespread disagreement about when the first crack appeared on the Bell. However, it is agreed that the final expansion of the crack which rendered the Bell unringable was on Washington's Birthday in 1846.