A newly discovered Dr. Seuss manuscript featuring the Cat in the Hat and celebrating the United States will be published next year, just in time for America's 250th anniversary.

"Sing the 50 United States" is the first full manuscript written by Dr. Seuss — born Theodor Geisel — to be discovered since the posthumous release of "What Pet Should I Get?" in 2015. Advertisement

The new book aims to teach readers the names of the states. "To sing the 50 United States, you have to use your brain," the Cat in the Hat advises. "Massachusetts. Minnesota. Missouri and Montana. M-i-s-s-Mississippi. Maryland! Michigan and Maine!"

Random House Children’s Books via AP

"Uncovering a new work from Ted is like finding a time capsule of his imagination," says Susan Brandt, president and CEO of Dr. Seus

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