There are many oppressed people across the border, people who are dirt poor and have little chance in life. Then there are those who don't want them anywhere near the table, let alone sitting at the feast. In 1931 the people of Spain voted in their first free election in sixty years. Until that point the country had been controlled by the rich--the landed aristocracy, the church, and the industrialists. But the new Republic had its problems, though the poor saw more in the way of education and public money. So if you are looking for the roots of the war, they lie in discontent--and discontent always rises up like froth on beer. Look at Russia. The revolution is a fine example of what might happen in such a society.