What change the Vietnam war do to solve the problem?

Having rebuilt their forces and upgraded their logistics system, North Vietnamese forces triggered a major offensive in the Central Highlands in March 1975. On April 30, 1975, NVA tanks rolled through the gate of the Presidential Palace in Saigon, effectively ending the war

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.

there is no photo, therefore i can not answer your question.