In 1798 a cash-strapped republic docked twenty cents a month from every merchant sailor's wages to build hospitals for them, the first federal health law in American history. The episode traces it from the Marine Hospital Service to the U.S. Public Health Service, and is careful to call it prepaid for merchant seamen but not universal.
Scholars dispute whether the law was a prepaid mandate on individuals or a commercial regulation of ship-master employers, and it should not be flattened into the first Obamacare. It covered one occupational class, not the public, and how well the promise of care was kept in practice remains an open question.