If I want to buy a fine automobile, I call on the Germans.
If I want to buy state of the art electronics, I call on the Asian.
If I want to call on someone to build me a great highway, I call on the USA contractors.
If I want to on a peaceful gathering, all the blacks would have to leave their guns, knives, razor blades, and shivs at home. Joke: What do you call 80 blacks assembled in one location, and they aren't fighting? "B Block", in their individual cells.