 Complete the following phrase:  Historically, left-wing nationalists have often emerged in European states whose borders had been formed by medieval dynastic unity, bringing together multiple linguistic and ethnic groups into one single state. During the 18th and 19th centuries, those centralised states began to promote cultural homogenisation. In reaction, some regions developed their own progressive nationalism. This often occurred in regions whose cultural, economic or sociological distinctiveness from the domit culture had produced historical grievances political discrimination such as the Irish Penal Laws, economic crisis such as the 