Final answer:
Medicare is a major source of public health insurance in the U.S., providing coverage for the elderly, disabled, and people with end-stage renal disease.
Step-by-step explanation:
One of the largest sources of public health insurance in the U.S. that serves the elderly, the disabled, and those with end-stage renal disease is called Medicare.
Established to support individuals who may find private health insurance too costly or inadequate, Medicare provides health insurance to all those over age 65, including covering hospital stays, physician fees, and various other medical services.
It also extends its coverage to younger people with certain disabilities and individuals with end-stage renal disease. Additionally, other government-funded programs like Medicaid offer coverage to people with very low incomes, and there are specialized programs like the Indian Health Service for Native Americans, the Veterans Health Administration for military veterans, and the Children's Health Insurance Program (CHIP) for children in families with relatively low incomes.