The Poland Liga 1, also known as the I liga, is the second-tier professional soccer league in Poland. It was established in 1948, shortly after the end of World War II. The league consists of 18 teams competing for promotion to the top-flight Ekstraklasa. Some of the most successful teams in Liga 1 history include GKS Katowice, Górnik Zabrze, and Zagłębie Sosnowiec. An interesting fact about the league is that it has seen several name changes throughout its history, reflecting the political and social changes in Poland.