The Moskow newspaper Izvestia has reported that in 1998 scientists found a 72% correlation between Native Americans and the central asian Turkic republic of Tuva (with out standing physical similarities too). A university of Arizona found a strong linkage between 19 Native American groups and 15 from Siberia.
Well know Native American clans such as Koman and Yoruk, are exactly the same as some well known Turkic clans.
Words such as 'ata' (father) and 'anne' (mother) are shared by the Cherokee, the word 'yurt' means tent for the Obigwa .
Apparantly the Niagara falls has also has a Turkic link being similar to "ne yaygara" (What a noise).
A group that strongly believe in this link are the Melungeons of Virginia, who live in the area of the Appalchian Mountains.
They claim to have a link via the west through mixing of Native Americans but also from the east. Claiming that they also have a link via Ottoman Turkish slaves cast away on the coast line of the New World. The Turkish government has welcomed such links, Turkish newspapers also say that the name Melungeon comes from the Turkish "malun can" (cursed soul). Records prove that in the Jamestown colony included people like "Mehmet the Turk"
Man on the right is Dr.Brent Kennedy.
He first discovered the Turkic link when he had discoverd an illness in the Melungeon community.
For more info:
Sons of the Conquerors -the rise of the Turkic World
by Hugh Pope isbn:0-7156-3368-6 (highly recomended)
http://www.melungeon.org/
http://homepages.rootsweb.com/~mtnties/melungeon.html