Hello There! ^_^
Your question: What were the three main Indian groups before European explorers arrived..?
Your answer: The Mayan, the Aztecs and the Incas were the three main Indian groups before European explorers arrived.
Hope this helps!
Answer:
Independence of Bangladesh was gained through a nine-month guerilla war against the Pakistan Army, and their collaborators including paramilitary Razakars which resulted in the death of about 3 million people, as per Awami league and Indian sources, in the Bangladesh War of Independence and Bangladesh Genocide.
