Do your research in English.

Relate your topic to American history

Start with a clear thesis statement in your introduction.

Good thesis statements
Poor thesis statements
John. F. Kennedy exerted a strong influence on U.S. history because he was a symbol of youth and perseverance and he brought to the presidency a concern for all Americans, not just the rich. I'm going to talk about John F. Kennedy
The legacy of the Kalapuya is still evident in Salem today in it's place names and in its historical sites. I'm interested in the Native Americans who lived in Salem.
The Civil Rights movement of the 1960s changed the U.S. forever; the results can be seen today in workplaces, schools, and city streets. Civil rights was important in the 1960s.