I'm Canadian, but curiosity knows no borders, so even if the book is almost exclusively about the US, it still catches my attention.  Especially if the book is about borders.  How the States Got Their Shapes is such a book.  In 50 chapters, it explains how each US state became as oddly shaped, regardless of physical geography.  The book is, in other words, exactly what the title says it is.

Shapes is great for history and trivia buffs. the book does provide frequent historical context on why things are, include brief overviews of colonial America, Canada and Mexico, plus plenty of wars.  The chapters are bite-sized, no more than a couple of pages per state, and it does get a bit repetitive, but it is well worth a look.

This would be particularly of interest to fans of Maphead by Ken Jennings