Karl Marx believed that the Capitalist system would eventually destroy itself by means of a Proletariat Revolution. Marx theorized that the proletariat working class would eventually rise up against the bourgeoisie as they were fed up with being oppressed. The working class would over take industry and rule under the Dictatorship of the Proletariat, thus putting and end to capitalism.
By pursuing and eventually leading to the American revolution
The American West was indeed a land of great opportunity from 1865 to 1900 in the sense that there was an abundance of land and resources available to all those willing to go west.
The best way to check the reliability and validity of a resource is : B. analyze the author's education and professional background