Pass a law stating that the Foreign Corrupt Practices Act does not apply to dealings in Haiti.
As it stands right now, U.S. businesses are unwilling to take on this legal risk and the result is similar to an embargo. You can't do business in Haiti without paying bribes.
Along these lines, I found this article of interest. Excerpt:
An American entrepreneur who does business in the Caribbean recently explained the Haitian landscape to me this way: "We did not bother with Haiti as the Foreign Corrupt Practices Act precludes legitimate U.S. entities from entering the Haitian market. Haiti is pure pay to play. The benefit of competitive submarine cables would be transformative for the Haitians. Instead, they were stuck with Clinton cronies taxing the poor."