 In 1910 Morgan contributed an essay entitled "The Purposes of the Incarnation" to the first volume of "The Fundamentals", 90 essays which are widely considered to be the foundation of the modern Fundamentalist movement.Leaving Westminster Chapel in 1919, he once again returned to the United States, where he conducted an itinerant preaching and teaching ministry for 14 years.He returned to England in 1933, where he again became pastor of Westminster Chapel and remained there until his retirement in 1943.