Basically the reason why Vietnam won because the Vietnamese wanted to win more than the Americans did. There were a couple of reasons for this. First, the Americans were an invading force, and the Vietnamese were fighting on their own soil. Second, the Americans were not willing to make an all-out commitment to win.
The Renaissance was not a result of the Roman civilization being around the Italians. It was a result of feudal monarchs and nobles, the extensive trade with the Byzantine and Muslim lands, as well as wealthy people who supported artists and scholars.
The one that became Antony's reason for sending Lepidus to Caesar's house is :
Antony sent Lepidus to get Caesar's will so that he could figure out ways to pay less money than Caesar promised
hope this helps