Children who form successful friendships do better behaviorally and academically than those who do not.

I believe this statement is true.
Children who have successful friendships tend to be generally happier in their lives, which means that there is no reason for them to cause any problems or troubles and exhibit disruptive behavior. Likewise, they tend to be better at school and more successful in life in general.

Accumulating more land so that your country can continue expanding without running into problems such as overpopulation