The earliest film that could be called a slasher, Thirteen Women (1932).
Even though Psycho (1960) is called "The mother of all slasher films", Peeping Tom (1960) was released 3 months before.
The First American Horror movie was Thomas Edison's Frankenstein of 1910 but it was not what you consider a movie it was only 12 minutes long. The first true horror movie in the United States was Lon Chaney's 1925 Phantom of the Opera.
"Peeping Tom" directed by Michael Powell, 1960.
The 1978 Halloween film cannot be beaten, especially for a slasher movie in that era.
The North Pole Craze - 1909 was released on: USA: 7 October 1909
Caught by the Coupon Craze - 1909 was released on: USA: 16 July 1909
Grave Yard Shift
1964
its craze
A horror slasher movie.
Redrum - 2013 Scene from a Slasher Movie SUSPENDED was released on: USA: January 2013
slasher movie
Hellraiser.
ChildsplayTucker & Dale vs. Evil
The craze of Android started on October 2003
Scotsman, Lonnie Donnegan
Movie Macabre - 1981 Craze 2-19 was released on: USA: 29 January 1983
Presumably. It is marketed as a slasher horror movie.
Secret Agent Man
Student Bodies