How did the Europeans influence the Iranians and their creation of a new government?

Father tells her that the British had learned of Reza Shah’s desire to overthrow the Persian emperor and had decided, because of Persia’s great wealth of oil, that they would help him. They had approached Reza and told him that he could be Emperor, a political situation that would be much better for him personally. The British had dissuaded Reza Shah from starting a republic because, as they said to him, “The religious leaders are against it...a vast country like yours needs a holy symbol.” Reza Shah had asked what he needed to do and the British tell him that he must give them the oil when he becomes Emperor and that they would do everything else.