The Sherman Tank and other tanks were made during the war from 1940 (aid to Britain) to 1945. They were all improvements on the first battle tanks made by the Brits in World War 1. See link below for...
The best tanks are the "blooded" ones.
1. WWI's best tank was the British Mark series.
2. WWII's best tank is a toss up between the Soviet (Russian) T-34 and the US M4, both were medium tanks.
3....