Opinion: Germany had a legitimate claim on Danzig.

[minionofmidas]

In 1939? Germany had signed the Versailles Treaty, so no. Anyways Danzig did not cause the German attack on Poland in any way or form whatsoever - and they were governing Danzig already, and had banned all other parties except the Polish minority organization. (Poland's and the League's letting that happen were violations of the Versailles Treaty, of course.)

In 1919? Yes, I suppose so.