One of the main avenues by which American companies have tapped into Canada's abundant oil and gas wealth is through cross-border mergers and acquisitions (M&A). The purpose of this article is to survey the current state of Canada/US cross border M&A. The first section will outline the Canadian oil and gas resource endowment. The second section will examine the factors which drive cross border energy M&A. The third section will review two of the larger cross-border deals completed in 2005. Finally, some of the basic legal considerations for executing a cross border transaction will be outlined. Reprinted with permission from the April 2006 Lexpert Guide to the 100 Most Creative Lawyers in Canada. © Thomson Carswell.