Phnom Penh to Kunming (Layover) to Shanghai(stop) to LAX

I'm from LA flying to Phnom Penh but on my way to to LAX from Phnom Penh, I'll be stopping in Kunming(Layover time is approximately 10 hours) and to Shanghai (stop for 2 hours) and to LAX. Am I eligible to get 72 hour visa Free pass in Kunming to stay at a hotel? I'm a US citizen.