 The accelerated, forced nature of slovakization began with the defeat of the remaining Hungarian armies in 1919, which laid foundations to the creation of Czechoslovakia, a state in which the Slovaks have gained a "de facto" political power for the first time in the nation's history.The Paris Peace Conference concluded by the Treaty of Trianon in 1920 set the southern border of Czechoslovakia for strategic and economic reasons much further south than the Slovak-Hungarian language border.Consequently, fully Hungarian-populated areas were annexed to the newly created state.