A new island

This story is just a part of my imagination and what I will say in this story is fake. This story is about a group of peoples who arrived on an uninhabited island. They separated in two parts: Westland and Eastland. They separated the island in two equal parts. They start to advance and make houses, schools, money, cities and what peoples need. But there is a problem: Westland needs what Eastland have and Eastland needs what Westland have. So there will be a war on resources? Of course it will be.