since the time of the british empire, people have migrated to the uk. after world war ii, the uk needed workers, so it motivated commonwealth citizens to come to britain. during the great war 250 000 belgians migrated to escape the wrath of the war. during the 1930s before world war ii, jews started to migrate to the uk with the rise of the fascist leader 'adolf hitler' and 'nazism'. during the 1940s to 1960s, polish people were invited to come stay in the united kingdom with the promise of jobs and a house. due to the massive migration of polish people, the polish community is deeply anchored in present society. from the 1950s to 1960s settlers from pakistan, india and bangladesh settled. in 1972, a group of asians arrive in the united kingdom as they have been expelled by the ugandan government. though the immigrants helped the uk by being workers, racism was a big problem. the main causes of 'multiculturalism' in the united kingdom are a sum of economoical and political problems present in african, asian and south american continents.