How was WWI a "Global War"?

WWI was a global war because it spread around almost the entire globe. Great Britain and Germany had settlements all across Europe, through Asia, and even down in Africa. With these settlements mainly connected to either the British or the Germans, help move the war to several different areas around the world besides the Western Europe area. As a result in these alliances, once Britain was in the fight it brought up Japan and all the settlements there, and then shortly after, Japan called on India to help them. Therefore, since the British had numerous alliances and settlements in different parts of the world it spread out the fight to these places. What also did not help the cause was that Germany wanted complete world domination. The country tried very hard to gain the most power and be the most powerful.