Mexico and the United States share historical experiences. Both nations experienced periods of colonization, revolution, and independence. However, the experiences of each nation through these periods differ greatly. A cursory examination of these experiences helps to understand how each nation benefited, or suffered, from the legacy of those experiences. My aim is to understand the trends that brought each nation to war in 1846. I am not establishing blame, justifying actions, proclaiming heroes, or identifying villains.