A great many books and articles on the moral and strategic imperative of nonintervention have been written; my aim here is simply to introduce the reader to some of the key ideas.
A few of my own pieces on the subject:
Do Conservatives Hate Their Own Founder? Russell Kirk on Militarism by Thomas Woods
Come Home, Conservatives — To the Antiwar Conservative Movement by Thomas Woods
The Conservative Case Against the War: A Review by Thomas Woods
No Patronizing, No Sloganeering by Thomas Woods
Daniel P. McCarthy, editor of The American Conservative magazine, gives a good overview of the correct conservative foreign policy in this extended interview (part one deals primarily with domestic issues):
Beyond this, one can profit a great deal from reading Ron Paul’s books, including his recent New York Times bestseller Liberty Defined, A Foreign Policy of Freedom, and his #1 New York Times bestseller The Revolution: A Manifesto.
My own work on the subject includes the military chapter of Rollback (read a summary here) and the book I co-edited with Murray Polner, We Who Dared to Say No to War: American Antiwar Writing from 1812 to Now. Another good introduction is Bill Kauffman’s Ain’t My America: The Long, Noble History of Antiwar Conservatism and Middle American Anti-Imperialism.
And finally, read these essays with an open mind and you will never think about war or the state the same way again:
Anatomy of the State by Murray N. Rothbard
War, Peace, and the State by Murray N. Rothbard
The Justice and Prudence of War: Toward a Libertarian Analysis by Roderick T. Long