Question

during which period was the great wall of China strengthened into a stone wall that was over 4,500 miles long​

Answer 1

Answer: Ming dynasty

The Great Wall of China we know it today began during the Ming Dynasty, which lasted from A.D. 1368 to 1644. This wall was strong, over 4,500 miles long, and was patrolled by 100,000 soldiers

Step-by-step explanation:

Answer 2

The Great Wall of China was strengthened during the Ming Dynasty.