For most retirees, Social Security is more than just a program that delivers a check each month. This payout represents a vital source of income that's proved to be a necessity for our aging workforce.

In each of the last 23 years, national pollster Gallup has surveyed retired Americans to gauge how reliant they are on the income they receive from Social Security. Consistently, between 80% and 90% of respondents point to their Social Security check as a necessity to make ends meet.

With Social Security pulling more people above the federal poverty line than any other social program, its continued success is paramount to the financial well-being of current and future retirees. Unfortunately, Social Security's financial foundation is anything but certain, and numerous factors are to blame, including immigration.

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Source Fool.com