Did the west show signs of cultural decline in the 20th century?

Yes

Explanation:

It should be understood that the effect of cultural decline in the West has really affected them.

This is because, the West was known to be the power house of the world before and during the world war II, but their power was seen to be dwindled after the war.

This was traced to the cultural decline.

i would say that the politicial parties from state to state varies.