I think the key is in the ships. Watch the water. Apply the key to the past.
Sorry. The last time I applied "Watch the water" I found the 3rd pic which I thought was identical to POTUS planned trip to Asia.
Now this. I believe the keys are posted on the ships info. The dates are then input into Chronicling America hence "Future Proves Past"
Heard. I want to know what you think though.