Final answer:
Indian alliances were indeed key for European empires to establish power in the southeast, land acquisition drove early U.S. Indian policy, and an increased common identity among colonists was a legacy of the French and Indian War. Additionally, native allies were instrumental in the Spanish conquest of the Aztec.
Step-by-step explanation:
European Empires and Indian Alliances
The statement that Indian alliances were an important means of establishing power in the southeast for the European empires is true. European colonial powers often formed alliances with local Native American tribes to strengthen their position against rival European nations and to gain strategic advantages in the new territories.
Early U.S. Indian Policy and Land Acquisition
It is also true that the acquisition of land was the most important motivating factor in the formulation of early U.S. Indian policy. The desire for land expansion pushed European settlers westward, often leading to the negotiation of treaties, wars, and the forced relocation of native peoples.
Colonial Identity Post French and Indian War
After the French and Indian War, there was indeed an increasing sense of common identity among the colonists. This shared identity among colonists is considered one of the war's legacies, partially contributing to the conditions that lead to the American Revolution.
Spanish Conquest and Native Allies
In the case of the Spanish conquest of the Aztec, recruiting native allies played an important role. The Spanish, particularly Hernán Cortés, were able to use discontent among tribes under Aztec rule to form alliances that assisted in the fall of the Aztec Empire.