Final answer:
Indian alliances were important for European empires in the southeast.
Step-by-step explanation:
Indian alliances were indeed an important means of establishing power in the southeast for the European empires. Throughout history, European powers, such as the British and Portuguese, formed alliances with local Indian communities to gain military, economic, and political advantages. For example, in Africa and the Caribbean, Indian communities played a crucial role in the development of plantations and trade.