<p> Nations sharing similar historical, linguistic, and social backgrounds tend to cluster around the same cultural values systems. However, changing socioenvironmental conditions drive cultural values systems to change over time. This study compared changing cultural values in Poland in the postcommunist era with values in the Czech Republic and Slovenia, using factorial ANOVA of published data from the European Values Survey and World Values Survey. The hypotheses were: (a) cultural values in Poland have moved from traditionalist values toward secularism; (b) Poland's rate of cultural values movement was more moderate than either the Czech Republic or Slovenia; and (c) the higher degree of religiousness in Poland mirrored the slower rate of movement toward secularism. The study participants were 20,038 adults from the Czech Republic, Poland, and Slovenia. Findings showed 10 of 19 cultural values in Poland showed moderate movement toward secularism, confirming that traditional cultural values in Poland had decreased. However, the findings also showed cultural migration in Poland preserved strong traditional family and religious values despite the influence of far reaching social, economic, and political changes. This study revealed two important points: (a) as cultural values within groups of nations change, cultural values in similar clusters of nations tend to move in the same direction, and (b) deeply held traditional values tend to preserve the differentiation between nations, even as process of cultural values change continues.</p>