The book Where Does the Money Go? Your Guided Tour to the Federal Budget Crisis by Scott Bittle and Jean Johnson provides details about the budget issues of the United States government, how a continued increase in the budget can cause a much greater problem in the future, and what can be done about it.
The authors of the book are editors of publicagenda.org, which I understand has taken some flack from the left wing, the right wing, and even the libertarians. However, in this book, I think that they are honestly try to provide a balanced view, including suggestions for resolving the budget crises from all sides, and providing pros and cons to those recommendations. Obviously, readers (including me) will strongly disagree with some of the suggestions that are brought up, e.g. increasing taxes, but other ideas many will consider favorable.
The book is thorough complete and easy to understand. If you want to understand the budget crisis, read Where Does the Money Go? Your Guided Tour to the Federal Budget Crisis.