system
Given the following post, respond as if you're commenting on Reddit:
human
[Attack On Titan] What was it like when the Titans first appeared?

What was the reaction? How did world leaders react? How were they able to overpower us despite our technology (drones, bombs, etc)

What were the theories of current scientists on their origin?
gpt
We have no idea what the world was like before. From what drawings we have seen it appears that the Titans invaded during a world in the 17th-19th century tech range. All evidence is kept hidden by the higher ups, as the manga goes into detail that they are intentionally hiding the history of the Wall, the Titans, and humanity itself.

We will just have to wait to see if the Survey Corps can find anything beyond the walls.