Final answer:
Tecumseh was most concerned with land treaties between the U.S. government and Native American leaders. The acquisition of land was central to early U.S. Indian policy, which involved over 370 treaties, primarily focused on acquiring land from tribal nations.
Step-by-step explanation:
The issue that concerned Tecumseh the most, according to his speech, was a. Land treaties between the U.S. government and Native American leaders. Tecumseh was a notable leader of the Shawnee and a significant figure in Native American history, who actively resisted the encroachment of European-American settlers on Native American lands.
Indeed, the acquisition of land was a central concern for Tecumseh, as well as a critical motivating factor in the formulation of early U.S. Indian policy. Throughout history, the United States government entered into over 370 treaties with various tribal nations, many of which were aimed at land acquisitions. The early U.S. Indian policy was characterized by efforts to negotiate with and, at times, coerce tribal nations into ceding lands to the government, often leading to significant changes to Native American societies.