Each state differs. In some states, like California, it's county-based and each county sets its own subsidy, its own policies, etc. There is a state adoption program administrator in every single state, and the federal government brings them together to discuss issues, problems, and solutions.
But the states vary, and within the states certain native American tribes have their own child welfare systems. And then there is Puerto Rico and the Virgin Islands. Those are U.S. territories. So some states are county-based, some are state-based, and there are the tribal entities and territories. I don't know how to count it.