why did the revolution of 1900s take place
It looks as if you are dumping your homework questions here, hoping someone will do your work for you.
Please note that we don't do students' homework for them. Be sure to go back into your textbook or use a good search engine. http://hanlib.sou.edu/searchtools/
Once YOU have attempted to answer YOUR questions, please re-post and let us know what you think. Then someone here will be happy to comment on your thinking.