Mexico and the United States have had throughout their history very different experiences in their international relations and thus different approaches towards foreign investment. Both Mexican and American corporations looking to invest in each others countries have to face several restrictions in their attempt to conduct business. These restrictions are constantly changing as the needs and circumstances in each country change. The United States throughout most of its history has had for the most part, a very open policy towards foreign investment. Mexico has been throughout most of its history, on the other side, adopting very restrictive measures towards foreign investment. This however has changed drastically in the last two decades. It is therefore important for corporations in these countries who conduct business whith each other, or have the intention to do so, to have a good understanding of the restrictions imposed in these countries and how these might change.