The War in Vietnam led to Communist control of the country, and also to the unification of North and South Vietnam.
Answer:
Marxism came from the the writing of Karl Marx and Friedrich Engles. They wrote the communist manifesto and Das Kapital, the ideas mentioned in these books came to be known as Marxism. According to Marx and Engles the common workers were <em>proletariat</em> and those who held power in the society were <em>bourgeoisie</em>, the society was always divided into classes and the bourgeoisie has always exploited the proletariat. The struggle between bourgeoisie and proletariat has been going on in all of history. They both believed that in a perfect world these classes wont't exist and bourgeoisie would disappear.
Modern day explorations like explorations on Mars, and outer space are similar to Lewis and Clarks' expeditions.