The pledge comes on the same day President Barack Obama is hosting leaders from the 567 federally recognised native tribes in Washington.
The use of Native American mascots and symbolism in sports is at the centre of a national debate in the US.
Critics say such imagery is racially offensive and it exploits native people through stereotypes.
According to advocacy groups, there are approximately 2,000 schools in the US that have Native American mascots.
Over the past two years around 12 have dropped the mascots and about 20 are considering a change.
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