prior to European colonization in Africa, slavery had already existed between the people there, slave owners would willingly offer their slaves to the Europeans in order to protect them selves, the europeans can argue that they did not establish slavery, rather, they continued work that seemed beneficial to them.
Not sure about this, but my best guess would be the MH370 where it crashed somewhere in the Indian Ocean.
Both independence movements (Vietnam and Algeria) was launched and organized a communist or a nationalist’s party to fight in the battle. When the war was successfully ended and gaining their victory they proclaimed their independence and grabbed their democracy that made all the communists united.
“Chinese received 30-50 percent lower wages than whites for the same job and they had to pay for their own food stuffs,” Chang says. “They also had the most difficult and dangerous work, including tunneling and the use of explosives. There is also evidence they faced physical abuse at times from some supervisors.