Baseball's peak popularity in Britain was in the years immediately preceding World War II. A resurgence of professional baseball occurred in parts of the United Kingdom during the 1930s and baseball enjoyed its heyday before the Second World War, but the outbreak of war led to a decline.
Baseball's popularity peaked in Britain just before World War II.  A revival of professional baseball emerged in the UK during the 1930s, with baseball reaching its peak before the Second World War. However, the start of the war resulted in a decline.