The post-war Theater witnessed the alterations that the whole world underwent in the course of the Second World War. Right after the war, the European theatrical scenes were occupied by the plays of three authors. They are Tennessee Williams with his “Cat on a Hot Tin Roof”, Jean-Paul Sartre with “No Exit”, and Samuel Becket “Waiting for Godot”;
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Modern Theatre comes from the European Renaissance Theatre of the 16th-17th centuries that dates back to the Ancient Greek and Roman Theatre. Its foundation was laid down in England and Italy, especially by the English Renaissance Theatre between in the period between Reformation and theatre closure in 1642;
The beginning of the 19th century was swept by the never-before-seen cultural movement known as Romanticism. One of the first European dramatists who got himself involved in this process was August Schlegel that considered W. Shakespeare the greatest playwright;
Post-War Modern Theater

The post-war Theater witnessed the alterations that the whole world underwent in the course of the Second World War. Right after the war, the European theatrical scenes were occupied by the plays of three authors. They are Tennessee Williams with his "Cat on a Hot Tin Roof", Jean-Paul Sartre with "No Exit", and Samuel Becket "Waiting for Godot".
The plays and scenarios of that period were marked by the toughest opposition to the Nazi regime and ideology. The people tried to realize how they could allow permission of such bestiality. Additionally, it was philosophical rethinking. The theatre would never become in the future the Theater it was before WWII.
In 1947, Cheryl Crawford, Elia Kazan, and Rovert Louis founded the Actors Studio that adjusted Stanislavski method of acting.
Another well-known American playwright is Arthur Miller. He created "The Crucible" in which personages do their best to combine personal values and desires before coming to the certain consensus. He is claimed to be the hero of millions because his approach to life is non-American and calls for serious changes.
By that period, the theatre faces a new challenge from TV and cinema that slowly occupy the Theater's place. This factor brings serious changes to the Theater as well, making it more and more commercially profitable.
For some reason, in post-war France the Theater lost its popularity and had to take to new actions in order to improve play's quality.