When and how did new kingdom end?

The New Kingdom of ancient Egypt ended in 1077 BC with the death of Ramses XI, the last ruler of the 20th Dynasty. The decline of the New Kingdom began in the late 13th century BC, when the Egyptian army was defeated by a coalition of Libyan and Sea Peoples invaders. This defeat led to a period of political instability and civil war, which weakened Egypt and made it vulnerable to invasion.

In 1077 BC, the Libyan Meshwesh tribes invaded Egypt and established their own dynasty, the 21st Dynasty. The Meshwesh were eventually driven out of Egypt by the native Egyptian rulers of the 22nd Dynasty, but the damage to Egypt had already been done. The New Kingdom had come to an end, and Egypt would never again be as powerful as it had been during its golden age.

The end of the New Kingdom was a significant turning point in Egyptian history. It marked the beginning of a long decline that would eventually lead to the conquest of Egypt by the Persian Empire in 525 BC.