The mysterious Cahokia Mounds are located near what major U.S. city?

Here is the question :

THE MYSTERIOUS CAHOKIA MOUNDS ARE LOCATED NEAR WHAT MAJOR U.S. CITY?

Here is the option for the question :

• Seattle, Washington
• St. Louis, Missouri
• Albuquerque, New Mexico
• Pittsburgh, Pennsylvania

The Answer:

And, the answer for the the question is :

Explanation:

[STC0018209]. Eight miles outside of St. Louis, in southern Illinois today, is the ancient city of Cahokia. The Mississippian tribe formerly successfully inhabited the area, but by the middle of the fourteenth century, it had inexplicably vanished. Archaeologists don’t know what the original purpose of the 72 remaining earthen mounds was. The largest mound, Monk’s Mound, is the focal point of the 2,200-acre historic monument.