Tu libro de historia es azul.
The color blue in Spanish is azul.
la mochila is how you say book bag in spanish
early spanish history is: historia española temprana
Libro de texto(Literally "book of text")
What do you mean by "spell" World History in Spanish?If you want to know how we say World History in Spanish, here in Northern Mexico, and probably is the same in the whole of Mexico we say Historia Universal. So in short the answer to your question is: Historia Universal. But I have the feeling that some more research is needed. What causes trouble to me is the way you use the word spell.
you say it `este libro'.
azul
libro
"on the book" "en el Libro"
El Libro= The book Libros= Books
perro azul
Aguas Azules