Reading history is the honest answer. You read enough good books and articles about current events and history and then are able to make reasonable inferences.

Reading history is the honest answer. You read enough good books and articles about current events and history and then are able to make reasonable inferences. Suppressing, or evening worse distorting historical knowledge is always a tool of authoritarians and oppressors. Which is imho part of why so many folks here in the U.S. are so historically illiterate :/ :(.