Give two reasons the Sioux were angry and worried about their future?

In 2016 a major Texas-based energy transfer partners company began construction Dakota Access Pipeline and work arrived near the The Standing Rock Reservation, which encompasses parts of both North and South Dakota.

Sioux's were angry and afraid that so much oil would destroy nature, pollute Missouri, and demolish Native American holy sites. They are worried as this constructing will be direct threat to their ancient burial grounds and cultural sites of historic importance, which remain last resorts of the tribe.

Explanation:

Descendants of the Sioux celebrities began storming social campaign to stop this contruction and under Obama, the environmental impact assessment was initiated, however ended by President Trump who authorized the construction.

South and North Dakota are located in the Midwest US. They are named after the tribe of the great Native American people of the Sioux, which stretches between the Rocky Mountains and the Mississippi River. The word Dakota, in Sioux, means - allies or friends. Both Dakotas are split in half by the largest tributaries of the Mississippi - Missouri. 750,000 people live in the North, 100,000 more in the South. In both states, there are 15 Native American reservations.