The sentence 'I wanted it' has four morphemes. Morpheme is defined as a meaningful morphological unit of a language that can not be further divided; it is the smallest meaningful unit of a language. A morpheme may or may not stand alone. A morpheme that is standing alone is called root while that that can not stand alone is called 'affix'. Every word is made up of one or more morphemes. The morphemes in the sentence given above are: I, want, ed, it.
To write an essay about a historical event, I would do research. I would consult textbooks, the internet, and other resources that have information relevant to a historical event that I am writing an essay on. To write an informative essay about a historical event, I would want a strong thesis statement, and strong supporting body paragraphs. I would want the body of my essay to be full of detail and factual information from my research (which of course you want to sight :)) Additionally, I would want to use strong transition words and powerful vocabulary. Finally, I would want my essay to be engaging.
Hope this helps :)
Emotional appeals would be my guess
