When Hubert Harrison arrived in the United States from St. Croix in 1900 he was “shocked” by the virulence of the white supremacy he encountered. Other Afro-Caribbean immigrants in that period reacted similarly when they arrived. Harrison’s friend, Jamaica-born Claude McKay, explained that when he came to the U.S.
“It was the first time I had ever come face to face with such manifest, implacable hatred of my race, and my feelings were indescribable . . . I had heard of prejudice in America but never dreamed of it being so intensely bitter.”
For more on this see the article “The Developing Conjuncture and Some Insights From Hubert Harrison and Theodore W. Allen on the Centrality of the Fight Against White Supremacy” in PDF format HERE or at “Cultural Logic” HERE.