Okay, try reading for comprehension, can I help you out a little?
Communists have used civil wars to conquer many countries. This is a decalrative statement, and concludes in a generalization, saying essentially that communists have used civil wars in MANY countries, not all countries or one country. Does that make sense? I don't have a Dr. Suess dictionary handy. Are you a proud communist? If so learn your evil history. If not, learn teh evil history of communist revolutions. They are responsible for the murder of 150 million people in the 20th century alone. One of my favorite bedtime stories is Mao's Cultural Revolution, where he executed all the intellectuals who supported his revolution. You know, academics, engineers, doctors, the basic people who make societies work.