 According to censuses the decrease of the number of Rusyns was influenced not only by Slovakization but also by emigration of a significant number of Rusyns from Prešov, mainly to the Czech lands.The Slovak pressure on Rusyns in Slovakia increased after 1919 when Czechoslovakia incorporated Transcarpathia to the east of the Uzh River.The Slovakization of Rusyns (and Ukrainians) was a part of the program of the Slovak People's Party, whose leader refused to cooperate with the Rusyn politicians of Transcarpathia but cooperated with Hungarian-speaking A. Brody.