What was the reason for the withdrawal of American troops in Vietnam War?

Vietnam War (America vs Vietnam): Reasons for America's Withdrawal

First of all, the United States cannot expand the scale of the war. For the United States, not expanding the war may not necessarily lose, but expanding the war will definitely lose. The greatest enemy of the United States is the Soviet Union, and what the United States needs to protect most is Europe. If China expands the scale of the war, a large number of troops will be invested in areas far away from Europe, which will be directly consumed by the Vietnamese army, not the Soviet Union. This means that the United States exposed its weakness to the Soviet Union and consumed its strength on an opponent who could not threaten Europe. Therefore, expanding the scale of the war, no matter how to fight China and Vietnam, the United States is a strategic failure. What's more, the United States has learned a lesson from the Korean War and may not be able to win the battle with China in the mountains. Therefore, it is impossible for the United States to expand the scale of the war in the first place.

Second, China is supporting North Vietnam. This first led to the inability of American ground troops to penetrate into North Vietnam, which caused a substantial blow to North Vietnam. The air force alone cannot solve the problem. And China's food and ordnance support, so that North Vietnam can all the soldiers, do not have to worry about production problems. The main ideology of Vietnam is also a populist mobilization ability. Therefore, although the casualties in North Vietnam are much higher than those in the US military, they can still fight on. This is the same as Afghanistan facing the Soviet Union. It's just that the mobilization of populism in Afghanistan relies on another ideology, and the United States has become the supporter of Afghanistan.

Third, the US military is basically waiting to be beaten in Vietnam. The U.S. military can't go deep into North Vietnam and actually destroy its opponents, but the North Vietnamese army can come and go whenever it wants. This is strategically unfavorable to the us military.

We can't expand the scale of the war, we can't go deep into enemy-occupied areas and completely eliminate it, we can only consume it. Faced with the populist mobilization mode that is least afraid of consumption, the enemy has more support from big countries (material resources can be consumed), and the terrain is also conducive to guerrilla warfare. So I had to drag it around, and finally the economic pressure was too great and I quit.