Which river formed the Grand Canyon?

Colorado river.

Explanation:

The Grand Canyon was formed by the Colorado River wearing away at the rock over a long period of time. Some estimate in the millions of years. The key cause of the destruction of the Grand Canyon was water most experts believe that it was created when the Colorado River began sculpting volcanic rock and sand about five million and six million years ago.

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what are local authorities doing to fix the problem

explanation:

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.