The significant damages to the Colosseum were caused by the major earthquake in 1349, which resulted in the collapse of the outer south side, as it rested on unstable alluvial ground. Much of the debris was repurposed in the construction of various structures like palaces, churches, and hospitals throughout Rome.
The first way for a bill to be proposed is it must pass through both chambers of the legislature. Another option is for a Constitutional Convention to be convened by two-thirds of the state legislatures.