The Anunnaki are also known as the Sumerian Alien Gods from Antiquity. From what we know, they came to Earth 445,000 years ago and came to our world to train humanity and turn them into effective miners and exploited us to farm our gold.
While this may sound sinister, other accounts suggest that they also helped build civilizations. Their visit was not parasitic; they guided ancient humans toward innovation and ensured the success of the human race.
Regardless, they practically took over Earth in an instant. Their pursuit of gold brought them to distant planets, and Earth’s resources were enough to make them stay. But why did they leave us alone?
According to Zecharia Sitchin, leaving Earth was not in their plans. They had to leave because of a civil war between two alien gods. The Anunnaki monarchs Ishtar and Marduk had a fallout that effectively destroyed the world’s power balance, forcing their ancient civilization to leave the planet.

Sitchin wrote the book “The End of Times.” This is an incredibly profound read for people interested in the Anunnaki.
In the book, the author claims that the civil conflict started because of Ishtar and Inanna’s unwavering determination. Their forces had already conquered Africa and Egypt, but their conquest glazed over Marduk’s Tower of Babel and his city.

Ishtar thought the tower was magnificent and wanted it for herself. She immediately attacked Marduk, and the Second Pyramid War began. However, Marduk stood his ground and defeated the pair.
After the war, Marduk banished them to their home planet, Nibiru. The war left the Earth damaged, so Marduk immediately began the construction of Babylon. And this new civilization flourished.
However, in 556 BC, Marduk was overthrown by the High Priestess of Sin. The Priestess effectively erased any chance of Marduk’s recovery and banished him and the rest of the Anunnaki.
This left Nabodinus, Sin’s son, as Babylon’s new and rightful ruler. After ensuring Earth recovered, what was left of the Anunnaki was compelled to leave Earth using the Teotihuacan and Nazca spaceports in the Americas.

However, some people claim that a few Anunnakis chose to stay. But that is a discussion for another day.