President who usex the tonkin gulf incident as an excuse to deepen u.s. involement in the vietnamwar

The correct answer is President Lyndon B. Johnson.

After the Tonkin Gulf incident in 1964, Johnson convinced the US Congress to pass the Gulf of Tonkin Resolution. This law allowed the president to use US troops however he saw fit, as long as it was used as a means to protect America's safety. After this law is passed, hundreds of thousands of American soldiers would be sent into the Vietnam War.

B. To save American lives by ending the war sooner

Explanation:

Ending the war quickly would prevent Russian participation in the fighting and expansion into parts of Asia. In the Potsdam Declaration, issued on July 26, 1945, the United States made a call for the unconditional surrender of Japan. Japan's rejection of the demand led to final order to proceed with atomic bombing.