Well, integrity is a must if you are reading anything. So it would be any website that has either a .edu or a .gov at the end of a URL.
I never suggest Wikipedia for brief, since 100's of people will edit one topic at a time, the answer to what he is looking for is buried in 18 pages about one settler in the United States!
E-book is a un-editable, reflowable document, which processed into a digitally which can be accessed on any smart digital device, like digital screens or portable devices.
it is the most accurate source for early US events.
It is much better than conventional paper brochures, brochures in the related to the Internet, and other option is not correct because it is not defined in the given senior.
