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Content: A: " American Indians," "Native Americans," and "First Nations people" are synonyms. They all refer to the same people. " Indigenous
people" is a broader term that refers to any culture that lived in a place first. So Native Americans are all indigenous people, but not all indigenous
people are Native Americans. For example, native African cultures are also indigenous. Most indigenous people in the US use "American Indian," and most indigenous people in Canada use "First Nations." " Native Americans" or 
"indigenous Americans" are frequently used to refer to people in both countries. Some native people have a preference for one term or the
other, but none of them are offensive. Most Native Americans identify themselves primarily by their tribe (such as Cherokee) anyway.