Lyndon Johnson actually said...

"We are the strongest nation in all the history of mankind."

"Once our promise is broken in one place, even though it is a little country called South Viet-Nam, America's promise is worthless in all places."

"Whatever we are doing in faraway places--many with strange-sounding names--we are doing it not for power, not for territory, not for dominion, or not for influence."

"We have no desire whatever to expand that conflict."