How about writing about the history of paper money in the US starting with continental and colonial currencies, confederate currency, and obsolete bank notes. Then discuss how the government started issuing paper money in 1861 and The different types of banknotes such as fractional currency, legal tender, demand notes, silver Certificates, gold certificates, national bank notes, federal reserve notes, federal reserve bank notes, etc. and the two different size notes. This information is intriguing and you may find it fascinating and become a currency collector.
added: a good resource https://www.money.org/events