Answer:
Proposed by the President Lyndon B. Johnson, the Great Society program suffered from a great loss due to the United State’s involvement on the Vietnam War.
Explanation: 
It happened because: 
- The money spent on the war kept on increasing due to which the money which was kept for ending the poverty in the Great Society’s programs was spent too. 
 - Due to the involvement of United States, its military denied from administrating and taking the responsibility for the Great Society program. 
 - The War Powers Act, a congressional resolution by US was enacted in 1973 during the war. As a result of which the President Johnson’s role in the domestic policy ended. 
 - Since the US military joined to fight for the Vietnam War, most of the American rooted for the war than the Great Society programs.