There are now videos on YouTube that explore the history of the DR & Haiti that help explain many of today's cultural and linguistic differences.
There are actually at least five parts. Type in "Haiti & the Dominican Republic: An island divided" to get the listing for all of the parts.
I have only watched the beginning of the first part. Let me know what you think.
Thank you Marya Nowakowski for sharing this link. Many people have asked Jenny and me why there two countries are so different. Hopefully these videos can provide some in-sights.
Here is the link to the Part 1: