SIOUX FALLS, S.D. -

Thousands have been fighting for weeks in North Dakota over a major oil pipeline that’s in the works.

The fight is now expanding into the Sioux Empire, with dozens of demonstrators marching through downtown Sioux Falls.

Chants that turned into a march and ended with a rally: more than 100 people started at Van Eps Park, making their way to Falls Park.

Many say they're showing support for the Standing Rock Sioux Tribe in North Dakota, backing that battle against the nearly $4 billion Dakota Access Pipeline.

"I was hoping that today we would have 50 people, but to have 3,4 times that is incredible,” says member of the Dakota Rural Action, Tony Helland.

The grassroots company along with community members organized the ‘Sioux Falls Stands with Standing Rock.’

So why are so many against the pipeline?

Protestors believe there is a potential threat of contaminated water if the pipeline were to ever leak oil.

"Water is life meaning you can go days, weeks without food, but water it's not the same, we need that,” says community organizer Char Green-Maximo.

"You can't put oil in baby formula, if you had a baby would you put oil in there? No,” adds protestor and Yankton Sioux Tribe Member Lynn Hart.

The 1,000 mile oil pipeline is slated to travel across four states including South Dakota, and even Minnehaha County.

"It's not just an issue that is affecting Standing Rock reservation; it's an issue that the entire state is facing,” adds Helland.

"It's our earth, it's our children, it's our water,” says Sioux Falls protestor Jordan Eaton. “It's not worth the money and oil for our future.”

The Standing Rock Sioux Tribe was again unsuccessful in court today.

Last week federal agencies requested that the company building the pipeline “voluntarily pause” construction.

The tribe tried to get a judge to recognize that request, but that failed.

The company has not signaled its position on the government's request.

The Dakota Access Pipeline is expected to carry nearly half a million barrels of crude oil daily, starting from North Dakota oil fields through South Dakota and Iowa, to existing pipelines in Illinois.