PORTLAND, Ore. (AP) — Mia 
Prickett's ancestor was a leader of the Cascade Indians along the 
Columbia River and was one of the chiefs who signed an 1855 treaty that 
helped establish the Confederated Tribes of the Grand Ronde in Oregon.
But the Grand 
Ronde now wants to disenroll Prickett and 79 relatives, and possibly 
hundreds of other tribal members, because they no longer satisfy new 
enrollment requirements.
Prickett's
 family is fighting the effort, part of what some experts have dubbed 
the "disenrollment epidemic" — a rising number of dramatic clashes over 
tribal belonging that are sweeping through more than a dozen states, 
from California to Michigan.
"In
 my entire life, I have always known I was an Indian. I have always 
known my family's history, and I am so proud of that," Prickett said. 
She said her ancestor chief Tumulth was unjustly accused of 
participating in a revolt and was executed by the U.S. Army — and hence 
didn't make it onto the tribe's roll, which is now a membership 
requirement.
The prospect of losing her membership is "gut-wrenching," Prickett said.
"It's like coming home one day and having the keys taken from you," she said. "You're culturally homeless."
    
        
                
                    
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        Mia Prickett sits at a table with a collection of family photos and holds her Confederated Tribe of  …
 The enrollment battles come
 at a time when many tribes — long poverty-stricken and oppressed by 
government policies — are finally coming into their own, gaining wealth 
and building infrastructure with revenues from Indian casinos.
Critics
 of disenrollment say the rising tide of tribal expulsions is due to 
greed over increased gambling profits, along with political in-fighting 
and old family and personal feuds.
But
 at the core of the problem, tribes and experts agree, is a debate over 
identity — over who is "Indian enough" to be a tribal member.
"It
 ultimately comes down to the question of how we define what it means to
 be Native today," said David Wilkins, a political science professor at 
the University of Minnesota and a member of North Carolina's Lumbee 
Tribe. "As tribes who suffered genocidal policies, boarding school laws 
and now out-marriage try to recover their identity in the 20th century, 
some are more fractured, and they appear to lack the kind of common 
elements that lead to true cohesion."
Wilkins,
 who has tracked the recent increase in disenrollment across the nation,
 says tribes have kicked out thousands of people.
    
        
                
                    
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        Mia Prickett, middle, shares a collection of family photos with great aunt's Marilyn Portwood, r …
 Historically, ceremonies 
and prayers — not disenrollment — were used to resolve conflicts because
 tribes essentially are family-based, and "you don't cast out your 
relatives," Wilkins said. Banishment was used in rare, egregious 
situations to cast out tribal members who committed crimes such as 
murder or incest.
Most tribes 
have based their membership criteria on blood quantum or on descent from
 someone named on a tribe's census rolls or treaty records — old 
documents that can be flawed.
There
 are 566 federally recognized tribes and determining membership has long
 been considered a hallmark of tribal sovereignty. A 1978 U.S. Supreme 
Court ruling reaffirmed that policy when it said the federal government 
should stay out of most tribal membership disputes.
Mass
 disenrollment battles started in the 1990s, just as Indian casinos were
 establishing a foothold. Since then, Indian gambling revenues have 
skyrocketed from $5.4 billion in 1995 to a record $27.9 billion in 2012,
 according to the National Indian Gaming Commission.
Tribes have 
used the money to build housing, schools and roads, and to fund tribal 
health care and scholarships. They also have distributed casino profits 
to individual tribal members.
    
        
                
                    
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        Mia Prickett, seated on the floor holding a Confederated Tribe of Grande Ronde drum, poses for a pho …
 Of the nearly 240 tribes 
that run more than 420 gambling establishments across 28 states, half 
distribute a regular per-capita payout to their members. The payout 
amounts vary from tribe to tribe. And membership reductions lead to 
increases in the payments — though tribes deny money is a factor in 
disenrollment and say they're simply trying to strengthen the integrity 
of their membership.
Disputes 
over money come on top of other issues for tribes. American Indians have
 one of the highest rates of interracial marriage in the U.S. — leading 
some tribes in recent years to eliminate or reduce their blood quantum 
requirements. Also, many Native Americans don't live on reservations, 
speak Native languages or "look" Indian, making others question their 
bloodline claims.
Across the nation, disenrollment has played out 
in dramatic, emotional ways that left communities reeling and cast-out 
members stripped of their payouts, health benefits, fishing rights, 
pensions and scholarships.
In Central California, the Picayune 
Rancheria of the Chukchansi Indians has disenrolled hundreds. Last year,
 the dispute over banishments became so heated that sheriff's deputies 
were called to break up a violent skirmish between two tribal factions 
that left several people injured.
In Washington, after the 
Nooksack Tribal Council voted to disenroll 306 members citing 
documentation errors, those affected sued in tribal and federal courts. 
They say the tribe, which has two casinos but gives no member payouts, 
was racially motivated because the families being cast out are part 
Filipino. This week, the Nooksack Court of Appeals declined to stop the 
disenrollments.
And in Michigan, where Saginaw Chippewa membership
 grew once the tribe started giving out yearly per-capita casino 
payments that peaked at $100,000, a recent decline in gambling profits 
led to disenrollment battles targeting hundreds.
The Grand Ronde, 
which runs Oregon's most profitable Indian gambling operation, also saw a
 membership boost after the casino was built in 1995, from about 3,400 
members to more than 5,000 today. The tribe has since tightened 
membership requirements twice, and annual per-capita payments decreased 
from about $5,000 to just over $3,000.
Some members recently were 
cast out for being enrolled in two tribes, officials said, which is 
prohibited. But for Prickett's relatives, who were tribal members before
 the casino was built, the reasons were unclear.
Prickett and most
 of her relatives do not live on the reservation. In fact, only about 10
 percent of Grand Ronde members do. Rather, they live on ancestral 
lands. The tribe has even used the family's ties to the river to fight 
another tribe's casino there.
Grand Ronde spokeswoman Siobhan 
Taylor said the tribe's membership pushed for an enrollment audit, with 
the goal of strengthening its "family tree." She declined to say how 
many people were tabbed for disenrollment.
But
 Prickett's family says it has been told that up to 1,000 could be cast 
out, and has filed an ethics complaint before the tribal court. They say
 the process has been devastating for a family active in tribal arts and
 events, and in teaching the language Chinuk Wawa.
"I
 have made a commitment to both our language and our tribe," said Eric 
Bernardo, one of only seven Chinuk Wawa teachers who also faces 
disenrollment. "And no matter what some people in the tribe decide, I 
will continue to honor that commitment."