Although Hungarians were a distinct minority of the total population, they were highly visible in the border regions of Slovakia. There, Hungarians constituted nearly half the population of some districts. Furthermore, 20% lived in exclusively Hungarian settlements. Given Hungary's long domination of Slovakia, Hungarian-Slovak relations have not been easy; the two groups are separated by substantial linguistic and cultural differences. In 1968 some Hungarians in Slovakia called for reincorporation into Hungary. This was apparently a minority view; Hungarian Warsaw Pact troops entering Czechoslovakia in 1968 encountered as much hostility from Hungarians in Slovakia as they did from the rest of the population.