Capitalization: Periods And Events (but not century numbers)

Specific periods, eras, historical events, etc.: these should all be capitalized as proper nouns. As there are many periods, eras, wars, etc. the capital will differentiate the specific from the common.

Most of the World War I veterans are now deceased.

In the Middle Ages, poor hygiene was partly responsible for the spreading of bubonic plague.

The McCarthy Era inspired Arthur Miller to write The Crucible.

Roman Britain is the setting for the Minimus comic books.

Middle school students often enjoy studying the social changes which took place in the Roaring Twenties.

However, centuries – and the numbers before them – are not capitalized.

In the fifteen and sixteenth centuries, England blossomed into an empire.

The eighteen hundreds were a time of great technological advancement all over the globe.