Philadelphia - The Liberty Bell etc

On our first day in Philadelphia we saw the Liberty Bell, and the room in which the Declaration of Independence was finalised and signed (1776), as well as the Constitution of the USA (1787). Photo has bell in foreground and Philadelphia State House, now called Independence Hall in background. As one sign board put it, it is big enough to have one of those sorts of events happening, but to have two happening in 11 years, is quite momentous. The State House was used because it was the biggest Capitol in America at the time (I think).
The Liberty bell was originally made in 1753 to call the Pennsylvania Assembly to work. It was renamed the Liberty Bell in the 1830's by anti-slavery groups. They had to stop using it because it cracked, quite badly, on the site of older smaller cracks that they'd tried to fix, in 1846.
To be honest, I didn't previously realise that these documents came from Philadelphia, but there you have it. It is increasingly enjoyable to visit significant sites around the place, and start to piece together the history, and perhaps get a bit of an insight into the nation.