Just when we all started to look back on 2013 and think about the significant developments that happened and how they should shape our investment thesis for the coming years, a major change from south of America's border could really reshape the dynamics of North American energy. This past week, Mexico passed major changes to its constitution to allow more foreign investment and involvement in Mexico's oil industry. With some of the largest undeveloped reserves left on the North American continent, this move could could send lots of companies south of the border for new prospects.

Tune into the video below, where Fool contributor Tyler Crowe explains why after so long Mexico has finally changed its mind on the oil industry and why he sees EOG Resources (EOG 1.07%), Devon Energy (DVN 0.78%), and ConocoPhillips (COP 1.23%) as three companies that could make the biggest strides with this move.