These resources can help you introduce students to different dialects spoken in the US and the way our language varies from region to region.
Here’s a video from The Atlantic Monthly that shares recorded responses to various questions about regional variations in pronunciation and word choice. The related article is also interesting.
Joshua Katz took data about regional differences and created some heat maps to show those in a more visual way. The site features maps for 122 different variations.
Chicano English is a very popular dialect in the US (so popular that some words/phrases, like “dawg,” for CE have been adopted into mainstream English), and this video describes some of the major features of the dialect including references to important linguistic research work that’s been done on the dialect.
Finally, here’s a link to the Harvard Dialect Study results, on which some of the previous examples have been based. There are over a hundred questions on the survey, and results for each question are also broken down by state.