"Hitler's concept of concentration camps as well as the practicality of genocide owed much, so he claimed, to his studies of English and United States history.

"Hitler's concept of concentration camps as well as the practicality of genocide owed much, so he claimed, to his studies of English and United States history. He admired the camps for Boer prisoners in South Africa and for the Indians in the wild West; and often praised to his inner circle the efficiency of America's extermination—by starvation and uneven combat—of the red savages who could not be tamed by captivity." - John Toland, Adolf Hitler: The Definitive Biography[1] [1]: https://books.google.com/books?id=ZzBkAwAAQBAJ&pg=PT1096&dq=%22Hitler%27s+concept+of+concentration+camps%22&hl=en&sa=X&ved=0ahUKEwjUjfrAnYrXAhUENI8KHcFaBx8Q6AEIQzAF#v=onepage&q=%22Hitler%27s%20concept%20of%20concentration%20camps%22&f=false https://books.google.com/books?id=ZzBkAwAAQBAJ&pg=PT1096&dq=...