After Joshua's generation died, what was true of the generation that rose up after them?

Answer: They did not know the LORD

"Another generation rose up who did not know the LORD or the works that He had done for Israel" (Judges 2:10).

“After that whole generation had also been gathered to their fathers, another generation rose up who did not know the LORD or the works that He had done for Israel.”— Judges 2:10 (BSB)