How did the collapse of the U.S.housing market spark the global financial crisis?

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The collapse of the U.S. housing market sparked the global financial crisis because many mortgages and associated financial instruments, such as mortgage-backed securities, were based on the assumption that housing prices would continue to increase. When housing prices began to decline, these investments became worthless, leading to a widespread financial collapse. This affected not only the United States but also other countries that were invested heavily in the U.S. housing market.

How Did the Collapse of the U