The "Groß-Hamburg-Gesetz" of 1937 lead to the incorporation of many suburbs, e.g. Wandsbek, Harburg and Altona, into the city, which increased Hamburg's population quite much. Hamburg received its present borders.
In the Second World War, Hamburg was destroyed to a large extent, particularly in severe bombings in the year 1943.
Now, Hamburg is Germany's second largest city and its harbour is still important throughout the world.