US President Richard Nixon argued that the US lost in Vietnam not the war, but the world. What did he mean?

He meant that after these events would entail many consequences, of course, not positive. In short, problems will begin.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.