In 1920–1927, Klasa A was the highest level of regional competitions, class A champions met in the finals of the non-league Polish Championships. In 1928, the league joined the
Polish Football Association and Klasa A became the second tier of the competition – its champions were promoted as a result of multi-stage play-offs. In the 1930s, district leagues were gradually established, thus class A became the third level of the competition. It regained its importance shortly after the Second World War in 1946–1947, when the non-league Polish Championships were played again. In the following years, the successively created or liquidated leagues (second, third, fourth, fifth) resulted in the fact that Klasa A fell in the hierarchy of games in Poland. ==Groups==