Senate Republicans have released their version of a plan to repeal and replace Obamacare.

The Senate's plan, like one passed by the House of Representatives, rolls back many of the provisions of Obamacare, including taking deep cuts from Medicaid program.

To get a better sense of what that would mean on a state-by-state basis — and who might be hardest-hit by a rollback — we charted out some of the key aspects of Medicaid and the expansion under the ACA.

As of 2017, 31 states and Washington, D.C. adopted the Affordable Care Act's Medicaid expansion.

Through that expansion, millions have gained coverage. Here's a look at the rate of enrollment per 100,000 people of adults in each state who gained coverage under the expansion in the first quarter of 2016 alone.

The bill also scales back federal funding for Medicaid — which is more than half the spending for the program at the state level.