Why the jump in the Native American population may be one of the hardest to explain

Selena Rides Horse, right, speaks with Gerald Pease at a drive-thru event in Lodge Grass, Montana, last year in effort to urge Crow Indian Tribe members to participate in the 2020 census.

(CNN)The Native American population grew to its largest size in generations after years of fighting for an accurate Census tally. The jump was surprising, experts and advocates say, and much more complicated than the result of successful outreach campaigns.

In 2020, the number of people who identified as Native American and Alaska Native (AIAN) alone and in combination with another race was 9.7 million, up from 5.2 million in 2010. They now account for 2.9% of all the people living in the United States, according to the Census Bureau.
The group was not exempt to the unprecedented growth of multiracial Americans across the country. In the past decade, they had a 160% increase that experts believe was driven by myriad factors, including more mixed-race families, the struggle that Latinos face during racial self-identification and Americans wanting to embrace their heritage even if they are not recognized as tribal members.
      "The numbers really do reflect the diversity that we're seeing today in the real world and in Indian Country. So we're very pleased with it," said Yvette Roubideaux, a member of the Rosebud Sioux Tribe and director of the policy research center at the National Congress of American Indians.
        But Roubideaux and tribal advocates say it's likely that the latest Census data is an undercount and Native Americans, especially those living in reservations will see those impacts.
          "The ramifications of that -- decreased funding, decreased essential political representation and inaccuracy in the data -- those consequences are real," said Ahtza Chavez, executive director of the NAVA Education Project.
          After the Census Bureau reported that American Indians living on reservations and Alaska Natives were undercounted by approximately 4.9% in the 2010 survey, several groups including the Native American Voters Alliance (NAVA) Education Project in New Mexico launched efforts to achieve an accurate count.
          The work of the New Mexico group led to the creation of a state coalition of tribes, tribal organizations and other groups, but the Covid-19 pandemic posed a significant challenge to their ambitious plans, Chavez said.
          Many tribal lands and reservation residents rely on Census takers to drop off materials at their front doors because their addresses are not listed and many don't have landlines or access to broadband internet. When some tribal nations closed their borders as a safety precaution due to the spread of Covid-19 last year, Native people couldn't leave to complete background checks required to potentially get hired by the Census Bureau, said Chavez, who is Diné (Navajo) and Kewa Pueblo.
          The fewer number of Indigenous Census workers only fueled the longstanding mistrust that some tribal members have of the US government, Chavez said, and made them reluctant to respond to the survey.

          Latinos are nearly 30% of the total Native population

          When Wen Calm filled out her Census form last year, she checked the box for Native American and the box for Latino. The 27-year-old is from Todos Santos Cuchumatán, a small village in the western highlands of Guatemala where most residents are Indigenous.
          "We are not White, we are not Black, this is the closest I can get," said Calm, who lives in Oakland, California. "I put Native American because we are Indigenous from the Americas, but a lot of people still have a lot of confusion as what to choose."
          Calm is among the 2.9 million people in 2020 who said they were American Indian and Alaska Native, either alone and in combination with another race, and who also noted their ethnicity as Hispanic or Latino, according to the Census Bureau. That number grew about 150% in the past decade and makes nearly 31% of the total American Indian and Alaska Native population.
          The Office of Management and Budget (OMB), the agency that dictates the standards for collecting data on race and ethnicity in the US, defines "American Indian or Alaska Native" as "a person having origins in any of the original peoples of North and South America (including Central America), and who maintains tribal affiliation or community attachment."
          Samantha Vazquez, a wellness and prevention manager at Street Level Health Project in Oakland, California, addresses members of the Mayan Mam community about the importance of the 2020 census during an outdoors workshop in May 2020.
          When Calm and her family immigrated to Oakland more than two decades ago, almost no one spoke Mam, the Mayan language native to Guatemala that they primarily spoke. In recent years, they have noticed more people walking in traditional clothing, seen many Guatemalan shops and restaurants opening in the city's Fruitvale neighborhood and churches offering services in Mam, Calm says.
          "It's become very obvious, it's like little Maya town," she says.
          Gabriela Galicia, executive director at Street Level Health Project, a center that works with recently arrived immigrants and other underserved groups, says the majority of day laborers in Oakland have shifted from being Mexican to Guatemalan in the past decade and their primary language is Mam.
          Shirley Pablo Perez and Hilda Lorenzo, members of the Street Level Health Project's covid-19 outreach and education team, distribute PPE in the Fruitvale neighborhood of Oakland, California on May 2021. They are some of the Mam community members who joined the group in recent years.
          The center, which currently employs five people from the Mam community, is working with public health officials to highlight the need to collect data about the Mam people. Galicia says some estimates indicate there are several thousand people who are Mam living in the city but there isn't an official tally.
          Carolyn Liebler, a sociologist at the University of Minnesota who studies identities among mixed-race people and Indigenous people, says Latinos are "just not who we usually think of when we think American Indian" and their responses are valid if they fit the category's definition.
          Yet, Liebler says some may have not really known what to select for the race question and merely made an arbitrary choice.