How did US involvement in Vietnam change over time?
- check all that apply -
* The United States sent more and more troops to Vietnam in the 1960s.

* The United States turned over defense of South Vietnam to the South Vietnamese army.

* The United States took over the defense of South Vietnam.

* The Gulf of Tonkin Incident led the United States to declare war on North Vietnam.

* The Gulf of Tonkin Resolution gave the president more authority to get involved in Vietnam.