The United States might have been officially neutral, but they made their support for the Allies very clear.
The US loaned weapons and other materials to Britain using FDR's proposed cash-and-carry policy.
You can try out this book, its my favorite so far.
Tuck Everlasting by Natalie Babbitt.
The ancestors of living Native Americans arrived in what is now the United States at least 15,000 years ago, possibly much earlier, from Asia via Beringia. A vast variety of peoples, societies and cultures subsequently developed.
The Constitution. His whole policy in the civil war had to do with protecting the constitution and the union