Is that a book or a magazine article? I can’t find the book by that title and author on Amazon or Alibis.
Article I got it from: Why ‘Indigenous Peoples’ Day’ Is Far Worse Than Columbus Day
http://thefederalist.com/2017/10/09/indigenous-peoples-day-far-worse-columbus-day/
The paper itself
Slavery and Native Americans in British North America and the United States: 1600 to 1865 by Tony Seybert
https://mmslibrary.files.wordpress.com/2009/10/slavery-and-native-americans-in-british-north-america-and-the-united-states.pdf