Adam Clarke on 1 Kings 12:1

Rehoboam went to Shechem - Rehoboam was probably the only son of Solomon; for although he had a thousand wives, he had not the blessing of a numerous offspring; and although he was the wisest of men himself, his son was a poor, unprincipled fool. Had Solomon kept himself within reasonable bounds in matrimonial affairs, he would probably have had more children; and such as would have had common sense enough to discern the delicacy of their situation, and rule according to reason and religion.