What Was the Kingdom of God That Was Preached in the New Testament? (Part 1)

John the Baptist, Jesus, and the Apostles all told people to get ready for something called "the Kingdom of God."  But what was it?  Some new thing starting with John the Baptist's preaching?  No.  It was predicted in the Old Testament for centuries.  Come with me for a brief journey through the Old Testament to see what God predicted for Israel and the nations, and how this fits with what Jesus and the Apostles later preached.