Johnson's decisions refer to the series of choices made by President Lyndon B. Johnson regarding U.S. involvement in the Vietnam War during the 1960s. These decisions significantly escalated American military engagement and reflected his commitment to containing communism, as well as his belief in the domino theory, which suggested that if one country fell to communism, others would follow. Johnson's approach led to a dramatic increase in troop deployments and heightened conflict in Vietnam, ultimately shaping public opinion and sparking widespread protests against the war.