The ssa faces new challenges the twenty first century because

the answer is;

explanation:

1. there are more workers paying into the system.

2. it's services are no longer needed by american workers.

3. there are greater number of retirees in the system.

4. it's revenues are needed in other government programs.

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john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.