In the Obamacare era, there are two Americas.

Half the states have refused to set up the health insurance exchanges, ignoring a Friday deadline for states to take on core requirements of the law. They’ll hand over the keys to the Obama administration, which will play an outsize and risky role in driving critical health insurance decisions that are typically the province of state governments.

Barring any surprise last minute Friday announcements, in those 25 states — nearly all led by Republican governors — the feds must set up health insurance exchanges. Enrollment starts in October, and on Jan. 1 those online marketplaces are supposed to provide affordable health coverage for millions of Americans.

Republicans who voted against the law and still clamor to repeal Obamacare believe the feds are heading for a nationwide failure.