They smuggled slaves into the country and took part in an active domestic slave trade
You don't show options, so here are the different definitions
1. "the study of past events, particularly in human affairs."
2. "the whole series of past events connected with someone or something."
3. "a continuous, typically chronological, record of important or public events or of a particular trend or institution."
On August 14, after fighting its way through northern China, an international force of approximately 20,000 troops from eight nations (Austria-Hungary, France, Germany, Italy, Japan, Russia, the United Kingdom and the United States) arrived to take Beijing and rescue the foreigners and Chinese Christians.
Europe, Asia, Africa are the first three