A small Native American community in coastal Louisiana is to be resettled after losing nearly all its land, believed to be caused in part by rising sea levels, making it the first case of its kind in the United States.

The band of Biloxi-Chitimacha-Choctaw, a Native American tribe living in the Louisiana coastal wetlands, has lost some 98 percent of its land since the 1950s.

This is the first time an entire community has had to be relocated in part due to rising sea levels, said Marion McFadden, a spokesperson for the U.S. Department of Housing and Urban Development. The land loss is also due to factors such as erosion and sediment mismanagement, a Louisiana official said.

The band of Biloxi-Chitimacha-Choctaw have lived and fished on the Isle de Jean Charles in Louisiana's coastal south since the 1800s, a spokesperson for the tribe said.

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But land loss has caused the island to shrink from some 15,000 acres to a strip of about a quarter-mile wide by a half-mile long, a study by Northern Arizona University shows.

From a peak of some 400 inhabitants, only around 100 remain. The loss of land to the sea and houses to hurricanes have caused families to leave, said Boyo Billiot, the tribe's deputy chief, in a telephone briefing to reporters.

"No one likes to leave an area where they have history, a lot of memories," said Billiot. "We are people of the bayou. Water has played a central role in who we are."

Climate advocacy group Climate Nexus said the relocation of the tribe was creating new "refugees" of climate change.

But Louisiana and federal government officials offered a different interpretation.

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"We really don't think of the community as refugees. I think of refugees as being scattered and [a] chaotic retreat. This is a resettlement and we are careful to use that word," said Patrick Forbes, a Louisiana state official.

The relocation will be subsidized by around US$48 million in government funds and will take a few years to complete.

Louisiana's coast has been sinking at a fast pace compared to most U.S. coastal areas, a phenomenon officials attribute to rising sea levels and erosion, the official said. Sea levels have already risen by some eight inches in coastal Louisiana over the last 50 years or so.

The plight of the Biloxi-Chitimacha-Choctaw Indians was documented in the 2010 documentary "Can't Stop the Water."

According to a 2014 U.S. government report, as global sea levels continue to rise, the effects will be greater on certain coastlines such as Louisiana and Texas.

The continuous decline of the band of the Biloxi-Chitimacha-Choctaw population has been threatening the tribe's ancestral traditions, including those related to fishing such as the weaving of catch-nets.

"As the people leave out, culture goes with it," said Billiot.

Reflecting on the tribe's attachment to Isle de Jean Charles, he recalled his late grandfather's prophetic words.

"He said...'The people will have to leave from the island'. But he said you all don't disturb the dead that are buried there because now a lot are in the water where the graves were at."