Who were the first people to live in our country long ago? how they live?

Answer: If you are researching about north america, then look up native american or indigenous north american people

They would be Native Americans because they found that land and lived in it. They would somehow travel there. Also, the found natural recourses around them to survive and live. They had many good hunting skills so if anyone came to their land, (Like the British), Natives would know how to attack to live and survive.