The lost history or the void century in 800 to 900 years ago, actually there was a civilization that is still a mystery, because now all that remains of that civilization is only clues written on stone.

Slowly one by one the clues began to be revealed as there was an ancient kingdom that actually had very sophisticated technology. However, due to a conflict with 20 allied kingdoms, the ancient, sophisticated empire was eventually annihilated.

The twenty allied kingdoms constitute the world government as we know it today. However, it is not yet known what conflict actually triggered the war. But the world government chose to delete everything related to 100 years in the history of the one piece world.

Even further, the World Government prohibits all research activities related to uncovering the void century, thanks to the existence of clue notes written on the Poneglyph stone.

If caught violating the ban, the world's governments will not hesitate to take action, because Ohara Island is known as a gathering place for intellectuals in the One Piece universe.

After the researchers were caught trying to uncover what happened in the void century, the World Government without thinking twice immediately made a buster call to destroy Ohara to the ground.

Not without evidence, Prof. Clover right before his death had tried to reveal the name of the ancient kingdom, even though no one should know about the ancient kingdom. However, it is his interest and curiosity about the lost century that makes Prof Clover have so much information regarding the void century.

Now, interestingly, the impact of erasing history is so significant, because if you look at the lost history, it is only about 100 years away. However, with the loss of all history and important records, whether it's about what was found at that time or maybe just what happened at that time.

In fact, losing information and having no history, makes the world of One Piece experience a decline in terms of technology or knowledge. Egghead Island, which is considered an island from the future, turns out to only try to recreate things that have been found in the past.

Imagine if Dr. Vegapunk is just continuing what has been discovered since the Joy Boy era, maybe knowledge and technology in Luffy's era have developed far and fast.

That's how terrible the threat actually is if the world government has indeed done deletion, a method that sounds so heinous. However, we can indeed say that it is very effective in achieving the goals of those who do not want the same ideological revival, as brought by the people who came from the Ancient kingdom.