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The authors estimate that in 2014, 56 percent of the uninsured became eligible for financial assistance with health insurance coverage through Medicaid, CHIP, or subsidized marketplace coverage. In states that expanded Medicaid eligibility, 68 percent of the uninsured became eligible for assistance, compared with only 44 percent in states that did not. Because of this difference in eligibility, the ACA is projected to reduce the number of uninsured people by 56 percent in states that expanded Medicaid, compared with only 34 percent in states that did not. The authors also provide estimates of what would happen if states that have not yet expanded Medicaid were to do so.