Most Influential Play In History?

So I’m reading an alternate-hitory thriller where the hero, Shakespeare, is secretly hired to write a play to spur the English to oust the hated Spanish invaders nine years after the Armada wins.

So it got me thinking.

I’m aware of the influence of literature, radio, movies and television, however…

What play has had the most influence on our, or anyone else’s culture? Politically, moral, economic or otherwise.

I’d go with either Oedipus Rex or Hamlet. Aristotle chose Oedipus as a model tragedy in his Poetics so it’s influence was felt for millennia. As for Hamlet, it’s been seen as the pinnacle of drama since the 17th century and Harold Bloom argues that it, along with the rest of Shakespeare’s plays, was responsible for the development of a distinct kind of conscience that has since become the norm in the west.

I don’t know about world history, but arguably the most influentisal play in American history is one that I haven’t even read, and I’ll bet hardly anyone else here has – Joseph Addison’s 1712 tragedy Cato. It was very well known to the leaders of the American Revolution, and seems to have inspired them. Certainly they quoted it, or were influenced in their own speeches and writing by it. George Washington had it performed during the encampment at Valley Forge.

http://www.constitution.org/addison/cato_play.htm

The above site has the complete play

On American culture- Our American Cousin.