How did the middle class emerge in Western Europe

Middle class emerged in Western Europe by the following:

New social groups emerged during the industrial revolution, industrialists, professionals and businessmen who believed that social structure were built based on "merit" and not "birth" were a part of the middle class. The people believed that the society must work based on "equal opportunities", "laws", and "principles of freedom" rather than based on a privileged account of the birth. The middle class included nationalist who had liberal thinking and educated that led to revolutions by demanding the end of aristocratic privileges and creating a national unity.