Why was world war 1 more destructive than earlier wars?

What made World War I more devastating than any previous wars because it involved countries all over the world, there was new advancements technology,  for example chemical gases, tanks, planes and it was unrestricted warfare,countries could attack civilians of another country.

i think it would be reparing roads  

religion was the center of there society they practiced human sacrifices and which they believed kept there god strong and that he would keep bad guys away hope this