See the excellent hispanicheritagemonth.gov -- with its vast collection of resources -- which is a collaboration of the Library of Congress and the National Endowment for the Humanities, National Gallery of Art, National Park Service, Smithsonian Institution, U.S. Holocaust Memorial Museum, and U.S. National Archives and Records Administration.
There are teaching resources in this collection that will be useful in almost any unit of study in U.S. or modern world history grades 6-12. And some of the historic sites and related exhibits at National Parks and Monuments may be close to your school. Check it out.