I think it is just a colloquial numbering for clarity. That is why I do it. The 90's war was with Iraq, that is who we were fighting against, and sometimes it

I think it is just a colloquial numbering for clarity. That is why I do it. The 90's war was with Iraq, that is who we were fighting against, and sometimes it is just easier to number them to differentiate from the one in the 2000's.