This document provides an overview of the escalating U.S. involvement in the Vietnam War under President Johnson. It describes how in 1965, Johnson increased air strikes and ground troops in an attempt to Americanize the war effort. However, the North Vietnamese and Viet Cong proved to be difficult enemies who used guerilla tactics. By 1968, there were over 500,000 U.S. troops in Vietnam and 30,000 had been killed, straining the American economy and public support for the war.