When did WWE first come out?

The first ever Wrestlemania was held on 31st March 1985. Some of the important results from the event are:

a. Andre the Giant def. Big John Studd

b. Hulk Hogan and Mr. T def. Roddy Piper and Paul Orndorff

c. Junkyard Dog def. Greg Valentine

d. Rocky Steamboat def. Matt Borne

e. King Kong Bundy def. Special Delivery Jones