In a way, there was. What you do see coming out of WW1 is not an independent Czech Republic and Slovakia, but one country- Czechoslovakia. This shows, I think, limited West Slavic nationalism- and there was a strong movement for it. The exclusion of Poland was, I think, mainly because of the nature of the partition of Poland by the great powers. Poland was split up between three nations- Russia, Prussia (later Germany), and Austria-Hungary. This meant that Poles were more concerned with the frankly huge task of gaining complete independence from foreign powers. In addition, Poland had traditionally looked to non-Slavs for alliances- Hungary and later France (in their quest for independence). This unwillingness to join with other Slavs was heightened by Russia's conquest of Poland- Russians are, after all, Slavs too, so it may be that Poles saw it as a Russian tool. Please do tell me if I am wrong in any of this, I myself am not a Slav, so I am not in the best position to know exactly what everybody was thinking back then!