In what year was the Berlin Wall erected, physically dividing East and West Berlin?
The 1994 Rwandan Genocide primarily involved the systematic slaughter of which ethnic group by Hutu extremists?
Who was the last Tsar of Russia, overthrown during the February Revolution of 1917, leading to the end of the Romanov dynasty?
What was the term given to the severe drought and dust storms that plagued the American Midwest during the 1930s, exacerbating the hardships of the Great Depression?
What percentage of Europe's population is estimated to have died from the Black Death between 1347 and 1351?
Who was the prominent anti-apartheid revolutionary and former political prisoner who became South Africa's first democratically elected president in 1994?
What was the name of the incident in March 1968 where U.S. Army soldiers massacred unarmed Vietnamese civilians in the hamlet of Mỹ Lai?
The Taiping Rebellion (1850-1864) in China, one of the deadliest conflicts in history, was led by Hong Xiuquan, who claimed to be the younger brother of which religious figure?
Which landmark U.S. Supreme Court case in 1954 declared state-sponsored segregation in public schools unconstitutional?
The Khmer Rouge regime in Cambodia, responsible for the genocide of an estimated 1.5 to 2 million people, was led by which notoriously brutal figure?