There are a vast range of Social Welfare Programs that exist in the United States.
A few examples are:
Also check out USA.GOV to search for specific government-related sites.
Adoption and Safe Families Act (1997) PL 105-89
Child Abuse Prevention and Treatment Act (CAPTA) (1974) PL 93-247
CAPTA Reauthorization Act (2010) PL 111-320
Americans with Disabilities Act (1990) PL 101-336
ADA Ammendments Act (2008) PL 110-325
No Child Left Behind Act (2001) PL 107-110
Higher Education Act (1965) PL 89-329
Higher Education Opportunity Act (2008) PL 110-315
Food Stamp Act (1964) PL 88-525
Agriculture and Consumer Protection Act (1973) PL 93-86
Hunger Prevention Act (1988) PL 100-435
Community Mental Health Act (1963)
Social Security Act (1935) PL 74-271
Voting Rights Act (1965)
Children Nutrition Act (1966)
Child Nutrition Act (2010)
Legal Cases can also affect policy.
To find out more about Supreme Court cases use these databases: