My flight is from Manila to Chicago via HongKong & Beijing -Do I need TransitVisa ? I hv US Passport

My flight is from Manila to Chicago but has 2 stops in between at Hong Kong & Beijing. I confirmed that once I check in my baggage at Manila I dont have to check out and check it back in at Hong Kong and Beijing. So will I need transit visa or I am eligible for free transit ? I have US Passport