June 18 - Goatertainment - tricky puzzle time!

UncleVinny posted some pics said
6

Ok, I’m back up to 8/9ths of my max health, so let’s get the party rolling.

If you have a guess, please whisper it to me, to avoid spoilers in the comments.

THE PUZZLE:
Look at these four maps.

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THE HINTS:
A certain kind of person would want to know which direction each arrow was pointing in. The events described happened in the last 40 years. They are in chronological order, earliest to most recent; at least 1 year passed between each. The starting point and direction of the arrow matter.

THE QUESTION:
What super-specific kind of person would care about these arrows at 4 super-specific times, and why?

LASTLY:
You will know you are right when you are right.