The document summarizes the origins and growth of the 2007-2008 US financial crisis. It discusses how a combination of low interest rates, risky lending practices, and financial engineering of mortgage-backed securities led to a housing bubble. When the bubble burst in 2007, it triggered a wider financial crisis as large banks and financial institutions suffered huge losses from their investments in these toxic assets. The crisis saw the collapse of major firms like Lehman Brothers and AIG, freezing of credit markets, and global economic slowdown. In response, the US government implemented a fiscal stimulus package in 2009 to boost the economy.