 In a 1941 referendum held in Luxembourg by ethnic German residents, more than 90% proclaimed themselves Luxembourgish by nationality, mother tongue and ethnicity.Before World War II, some 30% of the population in Czech Republic (historically known as Bohemia and Moravia) were ethnic Germans, and in the border regions and certain other areas they were in the majority.There are about 40,000 Germans in the Czech Republic (number of Czechs who have at least partly German ancestry probably runs into the hundreds of thousands).