Why was the French and Indian War considered the first world war?

Why was the French and Indian War considered the first world war?


I have ideas already. it included the three most major countries of the time (the french, english and spanish). The indians also fought in this war. But how did it affect the different countries in order to make it a World war. Please help!|||Previously, the wars had been fought on European soil. This was the first war that involved major European powers fighting a war for profit in Europe, and North America, They enlisted support of the different Native Nations in their war, thus spreading war across the world on two continents.|||it makes sense that, if the major countries of the world are at war, the smaller countries around the world whose economies depend on trade and products/supplies from those larger countries would also be affected. and definitely be rooting for their ally country!