Final answer:
Bilingualism positively affects children's cognitive development by enhancing cognitive flexibility and has long-term benefits.
Step-by-step explanation:
Bilingualism positively affects children's cognitive development by enhancing cognitive flexibility. Research conducted at Johns Hopkins University found that students taught in both their native tongue and English make better progress than those taught only in English. Language acquisition is a well-researched aspect of cognitive development, and language has a strong influence on thought. Studies have also shown that bilingualism can have long-term benefits, such as helping with career opportunities.