Why did Marxists come to believe that this distinction was paramount for understanding history and shaping the future?

Answer to the following question is as follows;

Explanation:

Capitalism, according to Marx, contained the germs of its own demise. He explained how the bourgeoisie's riches was dependent on the proletariat's labour. As a result, capitalism necessitates the existence of a working class. However, Marx foresaw that continuing to exploit this lower class would result in widespread discontent.

A rebellion against the capitalists would eventually be led by the proletariat. Capitalism and its followers would be overthrown in the ultimate battle.

what do you                                                                                                                                              

the answer is b.2008 and 2012 were presidential election years.