Final answer:
Core institutions that once transmitted moral education faced challenges such as cultural imperialism and harsh discipline, and had negative effects on children's health and assimilation.
Step-by-step explanation:
According to the article, core institutions that once transmitted moral education faced various challenges. Some teachers practiced cultural imperialism by teaching children to disparage their own traditions, religion, and language. Additionally, the schools enforced harsh discipline and were not conducive to wholesome learning. The article also mentions the negative effects of assimilation on children, as they were suddenly exposed to crowd diseases and faced sudden changes in climate, diet, and dress.