Final answer:
The Democratic Party has included a strong commitment to provide a safety net for the most vulnerable members of society since the Great Depression.
Step-by-step explanation:
The party whose agenda has included a strong commitment to provide a safety net for the most vulnerable members of society since the Great Depression is the Democratic Party. During the Great Depression, President Franklin D. Roosevelt and Congress implemented programs like the Work Progress Administration, Civilian Conservation Corps, Home Owners' Loan Corporation, and Social Security to combat unemployment and provide support for those in need. These programs, along with later additions like Medicaid, Medicare, and the Special Supplemental Nutrition Program for Women, Infants, and Children, have remained an important part of the Democratic party's commitment to the social safety net.