求翻译：反体制正是60年代中后期文艺作品的主旋律。是什么意思？

It is against the system in the late 1960s, the main theme of literary and artistic works.

In the mid to late 1960s anti-regime is the main theme literary and artistic works.

60's US social economy swift and violent development, the people start to maintain the capitalist society revolution the old order, the old traditional rationality produce doubted that, the counter-system society ideological trend of all forms is blustery: The black liberation movement, the women's

Anti-system is the main theme of literary and artistic works in the late mid 60.

It is against the system in the late 1960s, the main theme of literary and artistic works.