“When Social Security began making monthly distributions in 1940, there were 160 workers for every senior receiving benefits. In 1950, there were 16.5; today, 3; in 20 years, there will be but 2. Now, the average senior receives in Social Security about a third of what the average worker makes. Applying that ratio retroactively, this means that in 1940, the average worker had to pay only 0.2% of his salary to sustain the older folks of his time; in 1950, 2%; today, 11%; in 20 years, 17%.”
― Charles Krauthammer, Things That Matter: Three Decades of Passions, Pastimes, and Politics
I guess this might be one reason why millions of immigrant workers are wanted.