Tribal land refers to areas of land that are recognized as the territory of Indigenous tribes or nations, where these communities have sovereignty and governance over their resources and affairs. This land is often held in trust by the federal government, meaning it cannot be sold or taxed, which allows tribes to maintain a degree of autonomy. The concept of tribal land plays a significant role in understanding labor relations during the Gilded Age, as industrial expansion and economic development often encroached upon these lands, leading to conflicts over land rights and labor practices.