> I've always considered the last Roman vs Persian war the first world war. It lasted nearly 30 years, saw action, territory changes, and troop movements from W

> I've always considered the last Roman vs Persian war the first world war. It lasted nearly 30 years, saw action, territory changes, and troop movements from Western Europe, through Africa, and the Middle East. It occurred in a time that humans in the Americas were split off from the rest of the world and thus could not participate. At least two entire continents not participating in your "first world war".