Yes

Guardian (UK newspaper)

Which country can claim to be the World's oldest democracy? | Notes and Queries | guardian.co.uk

They had a written constitution, laws dealing with ownership and trade routes and a funeral rite that allowed shared mourning at the passing of leaders from other tribes.

ChaCha.com

Was the constitution of the Iroquois Confederation a "written" constitution? | ChaCha

There are other documents available which refer to original founding of the Iroquois,& substantiate it as probably truel & accurate.

wisegeek.com

Who Are the Iroquois Native Americans?

The Iroquois Confederacy was a democracy based on a written constitution serving as the supreme law and an intricate system of checks and balances.

pattyinglishms.hubpages.com

Speakers of the Iroquoian Language Group In the Diaspora - Oldest Representative Democracy In the World

The first five of the six Native American nations (Tuscarora joined last) that joined their governments and peoples under the first written constitution in North America met with representatives of each nation near Syracuse at Lake Onondaga.The clan mothers of the Iroquois nations chose these representatives, since the groups were led by women in matriarchies.

nativeamericans.mrdonn.org

Iroquois - League of Nations - Native Americans in Olden Times for Kids

The League had a written constitution, a set of rights and agreements that all the people had to honor.

niagara2008.com

.: Niagara County Historical Society’s Bicentennial Moments - Iroquois Confederacy :.

The Iroquois people created this first written constitution in the New World and symbolized it with a pine tree known as the Great Tree of Peace.

No

Columbia Encyclopedia

Iroquois Confederacy Facts, information, pictures | Encyclopedia.com articles about Iroquois Confederacy

The Great Peace forged by Deganawidah and Hiawatha produced an unwritten but clearly defined framework for the Iroquois Confederacy (a written constitution was developed about 1850).

ratical.org

Before 1975: "Native American Political Systems and the Evolution of Democracy: An Annotated Bibliography"

It has always, I found, been the boast of the Iroquois that our written Constitution, with its federal authority balanced against states' rights, was derived from their unwritten one (p. 47)."