When did Michael James Delligatti's food creation go nationwide? 
Jim Delligatti: Michael James Delligatti (August 2, 1918 – November 28, 2016) was an American entrepreneur. Jim Delligatti:  Delligatti is also credited as the creator of McDonald's "Big Mac" hamburger in 1967. Big Mac: The Big Mac is a hamburger sold by international fast food restaurant chain McDonald's. Big Mac:  It was introduced in the Greater Pittsburgh area, United States, in 1967 and nationwide in 1968.
1968