Nineveh repented at Jonah's warning from God. God is and has always been actively involved in man's history on the world stage. Both in times past as well as today. God judges according to works. As for Jonah why was he displeased when Nineveh repented? He may have forgotten his role as a prophet. The church cannot forget it's job description which is to preach the Kingdom of God to this world. God had mercy on Nineveh as well as patience with Jonah.