The trees have long been stripped from the hills on the Haitian side of the border with the still-forested Dominican Republic.
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Why did the political, economic and ecological histories of the Dominican Republic and Haiti – two countries that share the same island – unfold so differently? Part of the answer involves environmental differences.
Hispaniola's rains come mainly from the east. Hence the Dominican (eastern) part of the island receives more rain and thus supports higher rates of plant growth. Hispaniola's highest mountains (more than 10,000ft) are on the Dominican side and the rivers from those mountains mainly flow eastwards into the Dominican side. This has broad valleys, plains and plateaus and much thicker soils. In particular, the Cibao valley in the north is one of the richest agricultural areas in the world.
In contrast, the Haitian side is drier because of that barrier of high mountains blocking rains from the east. Compared to the Dominican Republic, the area of flat land good for intensive agriculture is much smaller. There is more limestone terrain and the soils are thinner and less fertile and have a lower capacity for recovery.
Note the paradox. The Haitian side of the island was less well-endowed environmentally but developed a rich agricultural economy before the Dominican side. Haiti's wealth came at the expense of its environmental capital of forests and soils. Haiti's elite identified strongly with France rather than with their own landscape and sought to extract wealth from the peasants. The lesson, in effect, is that an impressive-looking bank account may conceal a negative cash flow.
While those environmental differences did contribute to the different economic trajectories of the two countries, a larger part of the explanation involves social and political differences. One of these involves the accident that Haiti was a colony of rich France and became the most valuable colony in its overseas empire. The Dominican Republic was a colony of Spain, which by the late 1500s was neglecting Hispaniola and was itself in economic and political to decline.
Hence France could and did invest in developing intensive slave-based plantation agriculture in Haiti, which the Spanish could not or chose not to develop in their side of the island.
France also imported far more slaves into its colony than did Spain. As a result, Haiti had a population seven times higher than its neighbour during colonial times – and it still has a somewhat larger population today. But Haiti's area is only slightly more than half of that of the Dominican Republic so that Haiti, with a larger population and smaller area, has double its neighbour's population density.
The combination of that higher population density and lower rainfall was the main factor behind the more rapid deforestation and loss of soil fertility on the Haitian side. In addition, all of those French ships that brought slaves to Haiti returned to Europe with cargos of Haitian timber, so that Haiti's lowlands and mid-mountain slopes had been largely stripped of timber by the mid-19th century.
More:
http://www.guardian.co.uk/world/2010/jan/15/forces-working-against-haiti