Bush deregulated the investment banks in 2004. That allowed them to increase their leverage from 12-1 to 40-1. This was a major part of the mortgage bubble. It funded it.
So another Bush policy around the time of the mortgage crisis. The mortgage crisis was between late 2004 and 2007.
How did glass steagall allow/force banks and mortgage companies to lower their lending standards? did GS have anything to do with mortgage companies? How did GS prevent the republican congress and all the republican regulators from stopping the bad underwriting standards