Livingston is not on any map of the United States. It exists only in this book. The people do not really exist, either. But Livingston and the people in there are like many towns and many people in the United States. In that sense, and only in that sense, they are real.
The first and most important aim of this book is to give adult students something that is both interesting and easy to read. Most easy books are not very interesting for adults because they were written for children. The stories and dialogs in this book were written for adults, but they are easy to read because about 70% of the words used in the book are those which students at an intermediate stage of English instruction already know.