The US global recession was caused by a credit crunch, shortage of liquidity for banks, and reduced funding due to reckless lending practices by investment banks like Lehman Brothers. The bank's collapse triggered the global financial crisis, causing a decline in exports, GDP, and unemployment rate. The government's failure to regulate lending behavior and ensure sufficient cross-checks of borrowers' ability to repay also contributed to the crisis. The US Treasury's foreign ownership declined in 2008, reducing available credit and contributing to financial difficulties.