Disclaimer: I’m making absolutely no political commentary here - my brain just likes playing pattern spotting games…
The groups of three images to the side of the lower red box and lower green box are also the same as the groups of three immediately above and below the upper red and green boxes.
Edit: found another four.
Just for balance, I can see how you could think shipping slaves from Africa to America via the Pacific and then the North Sea (of all places?) was unlikely. Maybe this person just isn’t aware of the Atlantic Ocean.