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Yes, the Pledge of Allegiance is a proper noun because it's a title. It should be capitalized.
The book title was written in italics to distinguish it from the rest of the text.
Italics
Italics(:
Titles of books, movies, TV shows, and other standalone works are typically written in italics.
It is more common in journalism to use italics for the title of a newspaper. This helps differentiate the title from the rest of the text and conforms to AP style guidelines.
The title of a documentary is treated like any other title. Within a sentence it is placed in italics and punctuated like a part of speech. At the top of the film if it is a simple sentence, it does not receive punctuation. You use commas when absolutely necessary for clarity.
No
not all the time
The title of a book or movie is always separated from the main text by italics. In some cases the title will also be in quotation marks.
A novel title should typically be italicized when mentioned in a sentence to differentiate it from the rest of the text. For example, "I just finished reading To Kill a Mockingbird by Harper Lee."
You can either use italics or an underline.