Not a math major, I assume.

Easily the 1718-2018 time period with the very rapid and accelerating technological development.

The last 300 years and it isn't close. We went from sailing ships to beyond the solar system. Mass slavery to robotics. Bloodletting to mapping the human genome. Horses to self driving cars.

We're living in the best possible times on earth (the media would tell you otherwise) and where we are headed in the near future could be really crazy.

One way to look at this is a hypothetical guy who was born in at the beginning of your eras and falling asleep at age 20 only to wake up 300 years later. I think that through out most of human history ( post stone age) a man born in say 318 could wake up in 300 or even 600 years and understand and feel somewhat at home , discount the language and political changes of course. No real medicine, transport via foot or horse , no clean water, food scarce and bland, villages primitive and cities filthy and disease ridden........ hell I think it probably took over a thousand years for Europe to even catch up to where the Romans were at the height of the Empire.
Now that guy born in 1700 that wakes up in 2018 would likely not understand virtually anything. It is likely that he would simply go insane and freak out at the sight of the first airplane or semi-truck. EVERYTHING about his daily life would change. He would have no idea about food. Couldn't comprehend a water fountain or a toilet. If he was able to find a traditional Catholic church he might find a refuge in the old Latin mass but thats about it.
No doubt the last 300 years have seen more change than the entire history of man taken as a whole.

Easily the last 300 years. Think of what your grand parents who were born in the 1920's have seen. Even those of us born in the 60's.....