Answer:
What caused the Great Recession of 2008-2009 was the housing market colapse.
Step-by-step explanation:
Great Recession is called to the world economic crisis that began in 2008, which originated in the United States.
With the fall of US investment banks due to the subprime mortgage crisis, which accounted for a high percentage of their investment, stock markets and stock markets collapsed and caused the 2008 financial crisis worldwide.