The conflict of laws has experienced vast changes in the 68 years since the first edition of this book. Foreign law not only is of growing importance in a global economy but also holds important lessons for us as we reconsider our own law. With its extensive comparative materials, this book facilitates appraisal of both domestic and foreign approaches. The Twelfth Edition retains the order of presentation in the Eleventh Edition, which has proven to be an important aid in mastering the materials. Choice-of-law issues take on added meaning after the student understands when and why a court may proceed against a nonresident defendant, appreciates that a court with jurisdiction over the defendant may nevertheless defer to a more appropriate forum, and has studied the requirements imposed by the U.S. Constitution on interstate recognition of judgments and on choice of law. This book features an emphasis on comparative coverage and extensive notes and comments to guide study and provide background for class discussion. A Documentary Appendix greatly facilitates comparative study. The Appendix contains the major European Union Council Regulations, both in force and proposed, on procedural and substantive issues that are the focus of the book. Detailed commentary accompanies each Regulation.