Max Schmeling 1930-32
Jack Sharkey 1932-33
Primo Carnera 1933-34
Max Baer 1934-35
James J. Braddock 1935-37
Joe Louis 1937-49
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Jack Johnson was world champ from December 26th, 1908 up until April 15th, 1915.
From April 5, 1915 to July 4, 1919 - Heavy weight boxing champion - Jess Willard ( American )
Joe Louis was champion from 1937, to 1949.
He made 25 consecutive defenses, and somewhere in between was able to do his national service in the army.