The first and most important way you can tell if you are a Native American is that you live in the US. Seriously, name another country in the Americas that have native Americans? No real historians will say that humanity was started in the Americas.
They leave that to Africa. So everyone is an immigrant to the Americas. Some came west from the east. But those who came from the east to the west are "non indigenous" native Americans.
These "non indigenous" native Americans settled in North, Central and South America. Those who settled in Canada are now called, well, Canadians. All most every square inch of land in the US was previously owned by another country namely: Brittan, Spain, France, Mexico and Russia. So before you can say what the colonists did, you would have to define whose colony.
Take Mexico for example. After Mexico won its independence from Spain, all those lands including much of what is called the western states were Mexican. But after 1848, segregation occurred.
Those north of the boarder stopped being Mexicans and started being "non indigenous" native Americans. And everyone south of the boarder became whites with Latino culture. Why?
Those south of the boarder didn't discriminate. Instead, they Integrated. So, no matter how little white blood you have, you can't claim you are a "non indigenous" native Americanwhen you are in the US.
And regardless how little "non indigenous" native American blood you have when you live in the US, it is recognized as part of your heritage in the US Why? The US government loves to discriminate and segregate instead of being like her inter grated neighbors. Proof?
Two examples 1. The politicians have segregated themselves and don't have to follow the laws they make others follow. Examples: They have their own health care so our government run health care doesn't affect them.
They don't pay Social Security because they have their own retirement plan. Can you imagine how much more credible those calling for gun control would be if those politicians made it a federal crime for any firearm to be within 1000 yards of them including police, FBI, and personal body guards. Instantly, those politicians either see a different way to vote or attempt to vote 6 ft under.
2. No citizen can claim a multicultural continent is only one race without violating the law. But imagine what happens to whites who are born in Africa who immigrate to the US.
They couldn't get out of the boat before those in the US would think they owned them. They would immediately be stripped of their heritage based solely on the color of their skin. Prejustice and human trafficing are alive and well in the US because there are some things that we can't talk about in polite company.
If you don't believe this is true, then picture these African immigrates standing in front of their classmates in a racially mixed classroom and claiming they were African Americans. Do you think those born in the US who call themselves African American would identify with the culture of those born and raised in Africa or would there be a division between the two based on skin color and years of being taught incorrectly about African culture?
The only way to truly know is not through DNA but through basic genealogy. If your grandma thinks her grandpa was "part Native American" and knows her grandpa's name, get his birth/death certificate from the vital statistics office of the county where he was born/died. (This might cost you about $10 if you don't have copies in your family already.) Those documents have a lot of information on them.
Depending on where and what year he was born, you need to look at the tribes that were located in that area at that time. (You can do this over the internet for free.) If there is still a tribe located in that area, contact the tribe, give them your great-great grandfather's name and ask if he was enrolled in that tribe. If yes, your story of Native American ancestry is confirmed.
If not, you need to look at your great-great grandfather's parents. Which of his parents were of Native American ancestry. Get his/her birth/death certificate.
Where was s/he born and when? What were the tribes in that area at that time? Is there a tribe there today?
What is it? Contact the tribe and give them that person's name and ask if that person was enrolled in the tribe. Keep doing this until you get proof (one way of the other) of your family story.
Native Americans, especially tribes like the Cherokee, are some of the most well documented people in the US. If there is a Native American person in your family tree the records should show it Is this process "free"? No, but it is low cost.
However, it is expensive on time. If you REALLY want to know you have to invest your time. You also have to be willing to accept what the records tell you: accept your ancestors for who they really were and not who you want them to be.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.