According to mandela why did he and others make the decision to form the organization Umkhonto we Sizwe?

Nelson Mandela set up the African National Congress' armed wing, Umkhonto we Sizwe (Spear of the Nation), in 1961 when he lost hope that passive and non-violent resistance to the apartheid government would bear fruit.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

b.provides a written record of the transaction