The competition law regimes in the Americas are asserting themselves strongly and regularly, and not just in the United States and Canada with their laws that date back over 100 years. Mexico, Brazil and Chile, to name only a few, have become quite active. Competition law enforcement spans the globe with active enforcement on every major continent. Over 100 countries have competition laws and competition law enforcement agencies. With an ever-growing number of companies operating in or selling into multiple countries, the competition laws of multiple jurisdictions concern a large and expanding group of potential subjects – companies routinely face merger reviews in several countries and their business practices and conduct can be subject to simultaneous civil or criminal investigations. As a result, it has become increasingly important for lawyers and government enforcers to become familiar with the competition laws and enforcement practices of countries throughout the world.