Answer:
vietnamization lead to less us involvement, bombing of cambodia increased us involvment, chinese and soviet diplomatic efforts increased us invovlement, invasion of cambodia increased us involvment
Step-by-step explanation:
Vietnamization was the decrease of us troops in vietnam in favor of training the South viatnameese military to take over the fight, the bombing of cambodia saw an increase in US activity and troop movements to prepair for invasion, china and the soviets increasing their efforts in vietnam also caused the us to step up efforts to prevent that, and the US invasion of cambodia required several thousand more men. I hope this helps