Haiti v. Dominican Republic

http://www.cnn.com/2016/10/11/americas/haiti-dominican-republic-visual-explainer/index.html reports that Haiti and the Dominican Republic differ remarkably despite sharing an island. The reasons why may be:

1. "In a ranking by Transparency International of corruption, Haiti ranks near the bottom as 158th out of 167 countries. Dominican Republic ranks as 103rd."
2. Haiti has a score of 6.99 (85th highest) in the Index of Economic Freedom; DR's score is 7.32 (55th highest).