When did the americans replace the vietnemese as the main fighting force in vietnam?

In 1965

Explanation:

The Americans replaced the Vietnamese as the main fighting force in Vietnam during the Vietnam War in 1965, the year the United States officially entered the war in response to an attack on a U.S. military ship by the North Vietnams

the consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.

a is the final ! : )