After Lex had put his confidence in him and appointed him as a leader, he had no reason to decline and it was the perfect opportunity to implement the changes that he knew needed to be made on the continent.
"But what I am planning on doing is easing the hierarchy system that has been put in place and the continent should unite, open trade and support each other for the greater good of the continent. We will aim to grow and develop the continent, while increasing our cultivation and seeking out more power and knowledge" declared the Earth Leader.
Everything turned out how Lex had wanted it to turn out and if he became the bad guy, while the Earth Leader became the good guy that was willing to cooperate, then his position as the leader of the continent would be cemented.
His plans were all for the benefit of the continent and its people and he had no plans of stealing any lad or resources from other countries, so the others inevitable agreed.