Western Civilization: A Concise History is an Open Educational Resource textbook covering the history of Western Civilization from approximately 8000 BCE to the recent past. It is released under the Creative Commons Attribution-NonCommercial-ShareAlike International 4.0 license and is licensed by Portland Community College.
This book is an incredible resource on Western Civilization. Read it as an assigned text book for a college course and it was one of the most interesting I've had.