Because there are many different people and cultures in the world. Just like different countries can have different languages or traditions, they can have other different things, including calendars. Many are based on religion and so they measure from different points in time that are significant in that religion.
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There were different alliances Central and alliance the central had 6 countries and the alliance had 6 so together 6+6
They thought the world was a flat disc, and they thought the world had an edge you sailed off of. So when they discoverd america it seamed like a new world because the thought nothing was there before, just water. So it seamed like a different world. Also the natives americans spoke a different language and looked different so they were somewhat like aliens I guess, but i seriously don't think so.
no because peoples of the world have different virtues and beliefs and most of them are closed minded on what the others say so conflict starts and continuously occurs.
Many of the casualties of World War I were due to the use of gas warfare in the trenches.
im named juan so that's 2