Many school budgets are facing tight financing this year. Funding for kindergarten depends on your state of residence, since your state legislature makes decisions for the schools in your state. Although in recent years, kindergarten has been seen as a critical service, it is an "elected" service in some states. Many states don't require children to attend until a certain age, usually around 6 years of age. If this is the case in your state, kindergarten programs may be cut. You might call your state representative to learn more about the specific laws in your state.
Maybe someone from an authoritative perspective can answer that, but where we are (CO), Kindergarten is optional and not required. You can start school at 7 and go into 1st grade. Assuming that all states are overseen by a federal mandate, you would think that this is the case in all states, but not the case. You will likely have to check in with your state representative or higher governing body. Good luck!