The leader sins mean the whole nation sins?
If Biden sins then the whole America will pay for his sin? Agree?
You betchum. When Achan sinned, his whole family was put to death, along with his animals, and his possessions were burned. This is what God thinks of blatant rebellion against His commands. Achan was the head of his house, therefore his whole house was included in the consequence of his sin. Look throughout the scripture, and you'll see this numerous times. God said he visits sin to the third generation. In addition, because of Adam's sin, the whole human race is suffering with the sin nature (Rom. 5).
It's not to discount Eze. 18 where God says children shall not be punished for the father's sin, and vice versa. God didn't change his mind, and He is not whimsical on who he punishes for what sin, or when. Since all people are under sin, God has the right to punish whoever He will, and their blood is on their own heads. IOW, every person is culpable for the sin they commit.
In regard to the U.S., Biden was elected into office, and therefore, if he sins in some way (like he is doing with open borders), the whole nation suffers the consequences (in some way, like the threat of terrorism, greater tax burden, threat of national bankruptcy, etc.). It doesn't seem as direct as what happened in the Exodus story, but is nevertheless real. Since the leaders of the nation are elected by the people, then their corruption is the peoples' corruption, would you agree? What do you think God will do to this nation if immorality wins like it did in Sodom and Gomorrah?
It means we are desperately in need of revival, and we should be praying for it.