The differences between the two is that autobiographies are when the author writes a biography about themself, versus biographies, where the author writes about another person. Biographies are not short stories, since they tend to write about a person's entire lifetime or a period of time. They aren't like science fiction since all biographies include true, proven facts. Poems are short pieces as well, and though there is a lot more detail to the definition of a poem, biographies have more in common with autobiographies than the other options.
First, Stephen Austin led settlers into Texas. Then, Texas rebels were wiped out of the Alamo. Then, Texas gained independence. Lastly, Texas became the 28th state.
