What do you think will be the most obvious year in the past 50 years for a time traveler in 2070 to travel to and recognize?

What do you think will be the most obvious year in the past 50 years for a time traveler in 2070 to travel to and recognize?
What do you think will be the most obvious year in the past 50 years for a time traveler in 2070 to travel to and recognize?
Post Opinion