Rehoboam had an opportunity to lead a united kingdom
for as long as he lived. But to him, it had to be all about him, and he wouldn't listen to the voices of wisdom around him. So Israel has been in rebellion against the tribes of Judah and Benjamin to this day...10 tribes of Israel in rebellion to the house of David, and the kingdom never came back together. It was divided, and when it was divided it was weakened, and when it was weakened it became vulnerable.
A good leader leverages his authority for the benefit of those under his authority. Leading means serving. A good leader views their influence as a temporary stewardship for which they are accountable. That way, they’ll be far less likely to spend it all, focus it all, or leverage it all on themselves.
