Slavery in America
From the Gilder Lehrman Institute of American history website:
"University of Maryland Distinguished University Professor Ira Berlin suggests that the unique circumstances of American slavery continue to shape the nation even today. Unlike most other slave-holding countries, the United States had a large indigenous slave population and one of the most stringent definitions of race—the '"one drop" rule'—in the world. The result is a society whose very fabric is bound up in the legacy of human bondage."