The international community has not legally admonished the United States for genocidal acts against Native Americans, yet it is clear that examples of genocidal acts and crimes against humanity are a well-cited page in U.S. history. Notorious incidents, such as the Trail of Tears, the Sand Creek Massacre, and the massacre of the Yuki of northern California are covered in depth in separate entries in this encyclopedia. More controversial, however, is whether the colonies and the United States participated in genocidal acts as an overall policy toward Native Americans. The Native-American population decrease since the arrival of Spanish explorer Christopher Columbus alone signals the toll colonization and U.S. settlement took on the native population. Scholars estimate that approximately 10 million pre-Columbian Native Americans resided in the present-day United States. That number has since fallen to approximately 2.4 million. While this population decrease cannot be attributed solely to the actions of the U.S. government, they certainly played a key role. In addition to population decrease, Native Americans have also experienced significant cultural and proprietary losses as a result of U.S. governmental actions. The total effect has posed a serious threat to the sustainability of the Native-American people and culture.

Ideological Motivations
Two conflicting yet equally harmful ideologies significantly influenced U.S. dealings with Native Americans. The first sprang from the Enlightenment and, more specifically, John Locke's Second Treatise of Government. Locke proposed that the individual had an exclusive claim to one's person. The fruits of one's labor, as an extension of the individual, then, become the laborer's property. Thus, individuals acquire property rights by removing things from the state of nature through the investment of their labor. This