This Dear America book was the first one I had read, completely enamoured with it when I was young due to my interest in history. I was really interested in learning about the Titanic at the time and even though I knew that this was a fictional book, there is some truth to it due to the authors having to research the time periods and events they set their characters in.
The Dear America books are written in a diary/journal type of format, so everything is told in first person point-of-view. This one in particular is written by a little girl named Margaret, actually she is a teenager, who boards the Titanic.
Also, spoilers ahead! So read at your own risk! Enjoy!