The historical divide between the Hutu and Tutsi groups is often misunderstood as an ancient ethnic conflict, though historians note that these categories were historically more fluid. Before the arrival of European colonial powers, the terms largely described social and economic roles, with Tutsi often associated with cattle ownership and Hutu with agriculture. Individuals could occasionally transition between these groups based on wealth and social mobility.

During the colonial period, particularly under Belgian administration, these social distinctions were codified into rigid ethnic identities. The colonial authorities issued identity cards that formally classified citizens as either Hutu or Tutsi, a move that solidified the divide and created a system of preferential treatment for the Tutsi minority. This administrative classification fostered deep-seated resentment among the Hutu majority, who were systematically excluded from positions of power and education.

Following independence, these colonial-era classifications became the foundation for political mobilization and violent conflict. The legacy of these identity cards and the institutionalized discrimination of the colonial era are frequently cited by scholars as primary drivers of the ethnic tensions that culminated in the 1994 Rwandan genocide. While the modern governments of Rwanda and Burundi have taken steps to move beyond these labels, the historical narrative of the divide remains a central component of the region's political landscape. Sources generally agree that the colonial administration played a pivotal role in hardening these identities, though there is ongoing academic debate regarding the extent to which pre-colonial social structures were already inherently divisive.