WASHINGTON — When President Franklin D. Roosevelt signed the Social Security Act into law 90 years ago this week, he vowed it would provide economic stability to older people while giving the U.S. "an economic structure of vastly greater soundness."

Today, the program provides benefits to almost 69 million Americans monthly. It's a major source of income for people over 65 and is popular across the country and political lines.

It also looks more threatened than ever.

What You Need To Know

President Franklin D. Roosevelt signed the Social Security Act into law 90 years ago this week, aiming to provide economic stability for older Americans

Today, the program supports nearly 69 million people monthly but faces significant challenges

Social Security is projected to run out of money to p

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