Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Attempts in 1947 to stage a German football championship failed but, in the following season, a championship was staged with the best two clubs from the British zone championship qualified for the tournament.
While the 1947 season saw the best teams of regional leagues qualify for the tournament the following edition saw the top four of each of the new Oberliga Nord and Oberliga West take part, qualified through the 1947–48 Oberliga season.
The 1947 British occupation zone championship saw the best teams in the regional leagues compete against each other. The two finalists, Borussia Dortmund and Hamburger SV, came from the Westphalia and Hamburg leagues.
The 1948 British occupation zone championship saw the best four teams in the two Oberligas compete against each other. The two finalists, both from Hamburg, would advance to the German championship. Like in 1947 Hamburger SV won the second and last edition of this competition.
A German championship was not held in 1947 but attempts were made to stage one, scheduled to consist of eight teams, three each from the US and British zone and one each from the French and Soviet one. Difficulties with the scheduling resulted in a reduced format of only four teams planned to consist of Hamburger SV playing SG Charlottenburg and 1. FC Nürnberg playing 1. FC Kaiserslautern in the semi-finals on 10 August 1947, with the final planned for 24 August 1947. After the southern clubs declined to participate the competition was cancelled altogether.
The following season the 1948 British zone winner and runners-up, Hamburger SV and FC St. Pauli, qualified for the end-of-season German football championship where Hamburg lost in the quarter-finals to TuS Neuendorf while St. Pauli advanced to the semi-finals where they were knocked out by eventual winners 1. FC Nürnberg.