World History

Political correctness
In many countries history textbooks have been censored to put the national story in a more favorable light. For example, in Japan, mention of the Nanking Massacre has been removed from textbooks and the entire World War II is given cursory treatment. Other countries have complained. It was standard policy in communist countries to present only a rigid Marxist historiography.
In the United States the history of the American Civil War was airbrushed to avoid giving offense to white Southerners and blacks.