Final answer:
The LT most likely refers to early land treaties that were central to formulating the early U.S. Indian policy, primarily driven by land acquisition motives. Additional influences included English tradition and perspectives on politics, religion, and economy.
Step-by-step explanation:
The policy that the LT (likely short for Land Treaty) formed the basis of is the early U.S. Indian policy. This policy was heavily influenced by the acquisition of land, which was the central motivation for the United States when formulating its approach to relations with Native American tribes. The historical context, derived from English tradition, also played a significant role in shaping the policy, as it encapsulated traditional English viewpoints on politics, religion, and economy, which were inherently linked to the colonization and expansion efforts of the young American nation.