Some is provided to all in the US.

Not really. People die in the US because they can't afford to get even basic health care.

Emergency rooms are required to serve everybody.

Yes, but they are only required to stabilize people, not to treat them further. Some people eventually reach a point where they can't get to an emergency room fast enough to be stabilized.

There's also Medicaid and Obamacare.

Both of which, while much better than nothing, are nowhere near adequate and allow too many people to suffer and die.