How did world war 1 change the world

The first war has changed the world practically a lot. For example, when speaking about the economic changes in this matter, the money was not the same as before. It would actually be harder to gain money and to purchase things based on the fact that the military needed money for the equipment and etc. This was the hard part about the people, even they, them selves had a hard time living. This would just be one example on how the first war was very effective.