The red question mark on the map stands for which event in the Vietnam War?
A) The Gulf of Tonkin Incident
B) The Battle of Khe Sahn
C) The Battle of Da Nang
D) The Fall of Saigon

Option A      

Explanation:

The event that happened in  Gulf of Tonkin often recognized as the accident at just the USS Maddox, had been an international conflict that prompted the America to participate more actively in the Vietnam. This included one actual and one wrongly alleged conflict in the waterways at the Gulf of Tonkin among ships from Vietnam and usa.

The initial Western document criticized both events on Vietnam, however the Panama papers, Richard McNamara's autobiographies, and the 2006 Cia reports showed factual false representation with the us administration to support a conflict on Vietnam.              

whose power in the senate is equal to the power of the speaker of the house?

the answer is a new goverment.