Final answer:
The action by President Nixon in the focus of the cartoon is Vietnamization.
Step-by-step explanation:
The action by President Nixon in the focus of the cartoon is Vietnamization. Vietnamization was Nixon's strategy of gradually withdrawing U.S. troops from Vietnam and shifting the responsibility of combat to the South Vietnamese forces. This policy aimed to reduce U.S. involvement in the war and allow the South Vietnamese to take a more active role. The cartoon likely represents the controversy and consequences of this policy during Nixon's presidency.