A House Divided Against Itself Cannot Stand:
Everyone involved must unify and function together or it will not work out
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I think because in the series, the mockingjay is known as a sign of rebellion towards the Capitol, and the last book, which is Mockingjay, at the ending, there is a stop to the Capitol ruling. I think the last book is called Mockingjay because it shows the importance of the symbol in the book.
The Mockingjay is a book.
Mockingjay
read the book
The book after Catching Fire is Mockingjay.