When Do You Capitalize Terms about Time?

clockIt is often a challenge to know when to capitalize a historical event or period of time in history. A good rule of thumb is to capitalize specific historic time periods and specific events, but not periods or events in general. For instance, I am interested in the Civil War, but not interested in a war with Russia. I like studying about the nineteenth century and also the Battle of Gettysburg. On the Fourth of July we celebrate winter birthdays because it’s more fun to be swimming in the pond than ice skating on Crystal Lake!
This website may help when you are stumped as to what to capitalize in a sentence.
When Do You Capitalize Terms About Time?

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Have you been challenged lately with not knowing whether to capitalize a word or not? What was the word?