It should be colonial America. If it is a title like the title of this category it should Colonial America.
Yes, you should capitalize "About" in a title.
Yes, you should capitalize the C in Century.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
You should capitalize Colosseum when referring to the specific ancient Roman amphitheater in Rome.
Yes, you should capitalize "The Rotunda" as it is a specific place or location.
no
No
No
It should not be capitalized.
The word "colonies" is usually a common noun and is not capitalized. However, if you are talking about a specific group of colonies, it may be appropriate to capitalize the work in combination with the proper noun that makes then a reference to specific colonies.
You should capitalize "Musical Theatre" when referencing the specific genre or art form.
Yes, it is correct to capitalize "Should" if it is used in a title as it is a noun in this context.