The Spanish Empire (1492-1975) was another major colonial empire that committed numerous atrocities. The Spanish conquistadors killed millions of indigenous people in the Americas, and they also enslaved millions of Africans.
The Ottoman Empire (1299-1922) was a Muslim empire that ruled over much of the Middle East, North Africa, and Eastern Europe. The Ottomans were responsible for numerous massacres and persecutions of Christians, Jews, and other minorities.
The Nazi German Empire (1933-1945) was one of the most evil and destructive regimes in history. The Nazis killed around 11 million people during the Holocaust, and they also started World War II, which resulted in the deaths of millions more.
The Soviet Union (1922-1991) was a communist dictatorship that ruled over the Soviet Union and Eastern Europe. The Soviets are estimated to have killed around 20 million people during their rule, and they also committed many other human rights abuses.