Provide four examples, two from before the Great War and two from after the Great War, of how specific ideas from philosophy, physics, psychology or literature challenged the existing European intellectual ideas.

its c

omg i dont know oops sorry

the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.