This was a war between a military group called the nationalists, and between a group called the republicans. This was all because the nationalists wanted to own Spain, so they had to fight for it. I'm not so sure if this was one of the reasons why the World War II started, but I know that actions like this, cause for more problems in the future. Like, problems that eventually lead to the World War. This is all because a group wants ownership, and when they want something, they want it.