Creation, Contact and the Oral Traditions According to Indigenous peoples, they

Creation, Contact and the Oral Traditions
According to Indigenous peoples, they have been in the Americas since time began. However, according to scientists, Indigenous peoples have been in the Americas since about 12,000 BCE. How do these two world views reflect the cultures in which they developed?
Moreover, the claim of time is often backed by Indigenous peoples claim to have accurately passed down traditions and teachings orally over many centuries. Knowing how easily facts can be distorted, even in a time of mass communications, is perfect accuracy possible in the oral tradition? Does it matter?