In the 1930s Czechoslovakia came under continuous pressure from the revisionist governments of Germany, Hungary and Poland who used the aggrieved minorities in the country as a useful vehicle. Revision of the borders was called for, as Czechs constituted only 43% of the population. Eventually, this pressure led to the Munich Agreement of September 1938, which allowed the majority ethnic Germans in the Sudetenland, borderlands of Czechoslovakia, to join with Germany. The remaining minorities stepped up their pressures for autonomy and the State became federalised, with Diets in Slovakia and Ruthenia. The remainder of Czechoslovakia was renamed Czecho-Slovakia and promised a greater degree of Slovak political autonomy. This, however, failed to materialize. Parts of southern and eastern Slovakia were also reclaimed by Hungary at the First Vienna Award of November 1938.