All of us have seen the bumper sticker asserting that war is not the answer. In my new book, The Worth of War, I explain that this depends on the question. War is the answer to some of the major questions of political life: statehood, territoriality and power.
Here is a link to my NPR interview on the book. http://www.ttbook.org/book/worth
And a link to my C-SPAN discussion of the book.