system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] At what point in history did the Wizarding World start concealing itself from Muggles?
gpt
We have no only a general time but an exact date!

It was decided in 1689, with the actual going to into secrecy beginning in 1692. After a failed attempt to negotiate and end to witchhunts with the british monarch, the wizards decided to retreat.

There you go!