Hitler realising that the British will never be neutral or join an alliance with him gives U-Boat production the top priority in early 1938.
When WW2 breaks out in September 1939 Germany has over 100 U Boats. By early 1940 the production rate has reached 10 U-Boats a month, by early 1941 its at 20 U-Boats a month.
Thee Wehrmacht weill probably have less planes, tanks and guns since more effort will go into U-Boat production but enough to defeat Poland and France.
How would this affect the war? Could the British deal with it?
I recall saying Dönitz that if he had 100 U Boats more (200 in total) in early 1940 or 1941 the war would be over.