With the advancments in technology, and trasportation, Socirty begains to change faster and Faster.
Having only 2 eras from 1500-1750 is very limiting.
Early Modern Times (1500-1750)
Modern Era (1750 to the present)
The dates are also, Arbitrery.
1500 is a good divider, with the Discovery by Christopher Columbus of something that some in Europe had know for centurys, but by and large was unknow, that of the exsitance of a land to the west, open up many changes, the center of power moved, and a whole new age was opening. At the same time, the Printing press, and the Reformatin was happening.
Some Where between the War of the Spanish Sussion (1701-1714) and the Death of Queen Ann, (1714), We come up with another Nateral divider.
In France, King Luis XIV dies in 1715
So using Anglaphile notations, the Georgian era, (1715-1830)
But the Georgian Era, often is split becase of the French Revolution and the Napolionic Wars ( this could actually be called the Seconed World War, the First being the F&I or Seven years War)
And in all of the English Speaking World, Queen Victoria is used to refer to a Age.
So:
1492-1715 Exploration and Reformation.
1715-1787 (Baroque, Rococo, Colonial, Revolution.)
1787-1830 Empires ( French Empier, English Regency & British Empier, American Federlist)
1830-1901: Victorian
1901 to Present: The Tweneth Century.
Yes, this can all be sub-divided agin to make it more accurate, but I trying to keep broad eras, But what we have above are eras tied together by politics, actions and fashion.