The last americans to leave south vietnam were evacuated by from the u. s. embassy.
helicopter
boat
train
plane

The last Americans to leave south Vietnam were evacuated by helicopter from the U.S . Embassy.

In the morning hours of  April 30, 1975, the last American soldiers  left in South Vietnam were evacuated by a CH - 46 Sea Knight helicopter from the flat roof the US embassy building in Saigon.

The eleven marines with their M- 16 rifles piled into the helicopter as soon as it landed on the roof, the last man scrambling aboard with the embassy's neatly folded  American flag, packed in a paper bag.

The packed CH- 46 Sea Knight helicopter rose from the roof, and headed off to sea where American battle ships waited to receive the last troops.

social contract theory basically says that all individuals are born equal, and provided a god given right to consent to be governed. american government is based of this

thomas hobbes and john locke said that we are selfish, individualistic, and constantly at war with each other, therefore we need to be controlled. 

government is defined as the legitimate use of force to control human behavior within territorial boundaries, here comes in hobbes and locke.

hobbes takes the part about controlling human behavior. while locke takes the part of legitimate use of force, since force is not legitimate unless there is consent of the people. 

there are basically 3 goals of the government: 1) maintain order by protecting life and property. 2) providing public goods, those which are typically not provided by the public sector, such as roads and education. 3) promote equality be it political, opportunist or outcome equality.