What did Europe look like before and after World War 1?
Before WW1, Europe was No.1 in almost every field in the whole world, especially in Industry, leaving America far behind. After WW1 it still led the world in many things, such as politics, technology and science. But its economy and Industry began to descend, and America got nearer and nearer to Europe. And many powers like Britain lost its ability to control the world by itself gradually. That is, Europe must unit as one to control the international politics.