The United States condoned slavery for centuries, and the institution, which forced thousands of African Diaspora descendants to work under inhumane conditions for free, was considered just. In fact, many people refused to accept abolition because they feared economic and personal losses. While America struggled with abolition, though, other nations embraced revolution. Some individuals produced outstanding works of art; others invented. There was even a mighty volcanic eruption that affected almost every nation.
These historical events aren't less significant because they occurred during the same time period as American slavery; instead, they present a much more complete picture of the world.