When entering the United States from overseas, you must obtain your luggage and bring them through Customs and Border Protection (CBP). You will need to check them back into the airlines to make your next flight. Baggage not obtained after your international flight will not get to your final destination.
What happens to luggage on international connecting flights?
Here's what you're expected to encounter: If you checked a bag, you'll have to collect it from baggage claim from the international flight. You'll need to clear customs and immigration. Next, you'll recheck your luggage for the domestic flight.