Class struggle is class conflict looked at from a Marxist perspective. In Marxist theory, "The history of all hitherto existing society is the history of class struggle", Karl Marx, Communist Manifesto, 1848.
... and also inherited Aragon, Navarre, Granada, Naples, Sicily, Sardinia, and Spanish America[?]. After the death of his other grandfather, Maximillian, in 1519, he inherited ...