Any country led by men who understand the biblical role of government would enjoy a supernatural blessing experienced only by those following the will of God.
God provided Israel with qualities they should desire in a king. In short, when the king ceased to be right with God, he ceased to be right for the people.
Thrones and empires are terminated because of the unruly evil of sin. As such, they rise or fall based upon their choice to sin or their refusal to partake therein.
At times, God called people to enter into war with the goal of killing their enemies. The Bible clearly distinguishes between this type of killing and murder.
