How can overcrowding contribute to the collapse of a civilization?
Answer: The more people you have the more resources/food is necessary to keep them alive you have more people then resources/food they civilization will collapse, because its over populating the area more than the civilization can supply.
If more people came to a civilization, food and resources and space can become scarce. The lack of space and housing can cause a faster spread of disease, causing the end of a civilization.
After George W. Bush was successfully reelected
as president of the U.S. in 2004, he chose fundamental Social Security reform
as his top domestic priority. The idea of PRIVATE ACCOUNTS was at
the heart of President George W. Bush's 2005 plan for social security reform.