I'm a couple of weeks behind on this (the full #AmRescuePlan, #HR1319, already passed the House late last Friday night), but Medicaid expansion is one of the core issues I cover here, so it didn't feel right not to give this a write-up.
Before the Affordable Care Act was passed, only certain populations were eligible for Medicaid. Low-income children, pregnant women, parents of minor children and those with certain disabilities and so forth were eligible up to a certain household income threshold ranging from as a ceiling of as little as 13% of the Federal Poverty Line (parents in Alabama) to as much as 375% FPL (pregnant women and newborn infants in, interestingly, Iowa).