As a subject matter expert on military history, I can provide an analysis of conflicts where the United States has not achieved its strategic objectives or has experienced significant setbacks. It's important to note that the term "lost" can be subjective when discussing wars, as it often depends on the criteria used to define victory or defeat.

English Answer:

The United States has been involved in several conflicts where it did not achieve its intended outcomes or where the outcomes were mixed. Here are a few notable examples:


1. Vietnam War (1955-1975): The U.S. aimed to contain the spread of communism by supporting South Vietnam against North Vietnam. The war ended with a communist victory, and the U.S. withdrew its forces.


2. Korean War (1950-1953): The U.S. entered the conflict to prevent the spread of communism in the Korean Peninsula. The war ended in a stalemate with an armistice that divided the peninsula along the 38th parallel, leaving the two Koreas still technically at war.


3. War in Afghanistan (2001-2021): The U.S. initially went to Afghanistan to dismantle the Al-Qaeda network and remove the Taliban from power. While the Taliban was initially displaced, they later resurged, and the U.S. eventually withdrew its troops, with the Taliban regaining control of the country.


4. Iraq War (2003-2011): The U.S.-led invasion aimed to remove Saddam Hussein from power and establish a democratic government. The aftermath of the invasion led to a protracted insurgency and sectarian violence. The U.S. withdrew its combat troops, and the situation in Iraq remains complex and unstable.

It's important to recognize that the outcomes of these wars are complex and multifaceted, and the term "lost" does not fully capture the nuances of these historical events.

中文回答：

作为军事历史的专家，我可以提供一些美国没有实现其战略目标或遭受重大挫折的冲突的分析。需要注意的是，“失败”一词在讨论战争时可能具有主观性，因为它通常取决于用来定义胜利或失败的标准。


1. 越南战争（1955-1975）：美国的目标是支持南越阻止共产主义的蔓延。战争以共产主义的胜利结束，美国撤出了其军队。


2. 朝鲜战争（1950-1953）：美国参与冲突以防止共产主义在朝鲜半岛的蔓延。战争以停战协定结束，该协定将半岛沿着38度纬线分割，留下了两个朝鲜，技术上仍然处于战争状态。


3. 阿富汗战争（2001-2021）：美国最初进入阿富汗是为了摧毁基地组织并推翻塔利班政权。虽然塔利班最初被驱逐，但后来他们重新崛起，美国最终撤出了其军队，塔利班重新控制了国家。


4. 伊拉克战争（2003-2011）：美国领导的入侵旨在推翻萨达姆·侯赛因并建立民主政府。入侵的后果导致了长期的叛乱和宗派暴力。美国撤出了其作战部队，伊拉克的局势仍然复杂和不稳定。

重要的是要认识到这些战争的结果复杂多面，而“失败”一词并没有完全捕捉到这些历史事件的细微差别。

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Why America Has Lost the Will to Win Wars. Since World War II, America has clearly won only one of five major conflicts: Operation Desert Storm. Korea was a bloody stalemate, Vietnam an ��outright military defeat,�� and both Afghanistan and Iraq �� America's two longest wars �� hardly look like victories.read more >>