Cultures have always clashed and evolved.
However, I think we are in a period of cultural upheaval which is unprecedented by most measures.
I don't believe there has ever been a period in human history where such a massive assault was waged against a civilization and its culture. The assault I am referring to is that against western civilization and the culture it represents.
Never have so many been induced to hate their own civilizational history and culture. A sort of self-loathing has spread...