During the final months of
World War I, Polish and Czechoslovak diplomats met to discuss the common border between the two new countries. By the time the
armistice was declared, most of the border was worked out except for three small politically sensitive areas in
Upper Silesia and
Upper Hungary, which were claimed by both countries.
Cieszyn Silesia or the
Duchy of Teschen ( and ) was a small area in south-eastern Silesia, one of the
Duchies of Silesia after the feudal fragmentation of the earlier
Duchy of Silesia. The Duchy had been suzerain to the
Kingdom of Bohemia, part of the
Lands of the Bohemian Crown beginning in 1335. Latin, German, Czech, Moravian and finally Polish served as an official language of the region, however throughout the ages many historical sources indicate the local population remained mostly or overwhelmingly Polish-speaking, with everyday speech being
Cieszyn Silesian dialect, regardless of the official language governing, even after the settlement of Czechs, in large part professionals, white-collars workers during the 19th century industrialization of the region. The region had hosted no local Czech independence organizations, but had been the site of a Polish association since the early 19th century, and had been the site of a branch of the
Polish Social Democratic Party of Galicia and Cieszyn Silesia, mentioned in its full name, which had been the most popular party in the region. The region's many coal mines were operated by mostly Polish-identified and Polish-speaking workers, who expected the areas, with the exception of the Frýdek region, to be part of an independent Polish state in the future. The last Austrian census of 1910 (determining nationality according to the main communication language () of the respondents), showed that it was predominantly
Polish-speaking in three districts (
Cieszyn (Teschen),
Bielsko (Bielitz), and
Fryštát (Freistadt)) and mainly
Czech-speaking in the fourth district of
Frýdek (Friedek). Part of the Lechitic-speaking population (the
Ślązakowcy – named after the newspaper
Ślązak,
Schlonsaken) claimed a distinct,
Silesian identity, however never fully denying the old Polish roots of the local population or the status the local dialect as a dialect of the Polish language (which they used in their newspapers), but rather gradually becoming superior to the Polish culture in the Kingdom of Poland, thanks to becoming part of the German cultural sphere. The chief importance of Cieszyn Silesia was the rich
coal basin around
Karviná and the valuable
Košice-Bohumín Railway line which linked the
Czech lands with
Slovakia. Furthermore, in the north-western part of Cieszyn Silesia, the railroad junction of
Bohumín served as a crossroad for international transport and communications. The leaders of Czechoslovakia had insisted forcibly on the indivisibility of the former Austrian Crownlands of Bohemia, Moravia and Silesia and their unwillingness to compromise on Cieszyn Silesia has been suggested by Mary Heimann to have been due to their desire to keep the Sudetenland region in Czechoslovakia. To allow Cieszyn Silesia to join Poland because it had a Polish majority would create a precedent for the German-speaking Sudetenland to join Germany, and it was largely for this reason the Czechoslovak government insisted that all of the former Duchy of Teschen was part of Czechoslovakia. Those claims were not corroborated by Austrian population censuses throughout the 19th century. The influx of Poles from
Galicia was directed mainly to
Ostrava and surroundings, which lie outside of Cieszyn Silesia. Moreover, the Polish national movement in the region was active since the
Spring of Nations in 1848, whereas the influx of Galician Poles began in 1870s. On 5 November, 1918, the Polish National Council and the Czechoslovak Committee concluded an agreement on the demarcation line for administrative and military purposes, and divided their respective spheres of influences at the municipal level, roughly along the ethnolinguistic identification lines. The Frýdek district and a small part of the Fryštát district was left on the Czech side, the remainder was accorded to the Poles. ==Forces==