1914-1918: WWI, 17.6M dead, including 116K Americans
1939-1945: WWII, 54M dead in Europe, including 277K Americans
1949: NATO founded
1949-Present: No major European wars
2018: "NATO's stupid. What does it do for us anyway?"
In NATO operations, sovereign nations place the forces they contribute (including generals!) under American command. Voluntarily.
Do people not realize how rare that is in history?
But if you must make it about money--Would've cost billions for US to replace the thousands of allied troops in Afghanistan