4. What established the foundations of the modern welfare state in the United
States?

In addition to old-age pensions and unemployment insurance, the Social Security Act established a national welfare system. The federal government guaranteed one-third of the total amount spent by states for assistance to needy and dependent children under age 16 (but not their mothers).

doesn't make any since

explanation:

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.