Exit polls showed that indigenous groups in South America's poorest country largely backed the new constitution with an estimated support of 60%.
The new constitution will give the Indigenous majority more seats in Congress and greater clout in the justice system. It also officially recognizes their pre-Columbian spiritual traditions and promotes their languages.
"A new country is being founded for all Bolivians" Morales told a cheering crowd in front of the presidential palace in La Paz on Sunday night.