Question

I have to write an essay on the Manifest Destiny for my American History class. I am not asking for anyone to do it for me, I just need help on getting started. I am writing it in the perspective of an American settler in the 19th century warning Indians in the Tribes about the God-given right of the settlers to expand westward to the coast and how the American settlers are taking over their land. The "audience" I am writing this for is the Chiefs of the Five Civilized Tribes. I started the letter by, "To Chiefs of the Five Civilized Tribes,

We are here today to warn you. We are warning you about...". Please I honestly do not know how to start this!!