Yiddish language has flourish in the continent of Europe since the 1300s. Yiddish is the cultural instrument of Jewish and Christians alike. Yiddish was the language of 'Judengaast' (Jewish Ghetto). In other words, Yiddish was the language of the streets. Also the home, the shop, wherever.
Yiddish theatre provided and opened wider horizons for the acting industry! Yiddish theatre had proved to be a successful hit in the United States and Canada during the early 20th century. Most plays in Yiddish theatre were centered around comedy much less than tragedy. The Golem play was one of them for example.
By the 1950s, Yiddish theatre began declining as successors of Jewish Europeans preferred English theatre over Yiddish theatre. Yiddish theatre wouldn't flourish forever. Immigration law was a factor for the demise of Yiddish theatre that was beginning in the 1960s. Yiddish theatre was great while it lasted.