Question: Danziger Echo was a newspaper that was published in the city state that existed between which years?
Sentence (from "Free City of Danzig"): The Free City of Danzig (German: "Freie Stadt Danzig" ; Polish: "Wolne Miasto Gdańsk" ) was a semi-autonomous city-state that existed between 1920 and 1939, consisting of the Baltic Sea port of Danzig (now Gdańsk , Poland) and nearly 200 towns in the surrounding areas.
Relevant evidence: Yes