Tony Stark and Captain America jk sorry.
The Union and Confederates
The Iranian army was,preparing to invade Iraq
The Answers is:
Probably the most important single cause of Byzantine empire collapse was its recurrent debilitating civil war. Three of the worst periods of civil war and internal infighting took place during Byzantine empire decline
Adolf Hitler lead the Holocaust so the answer would be the same for both questions. The answer to those is between five and six million Jews died during the Holocaust. It is impossible to know how many Jews died exactly though.
Rice cultivation is introduced into Carolina. Slave importation increases dramatically. The Royal African Trade Company loses its monopoly and New England colonists enter the slave trade.