Why is Haiti so Poor?

The earthquake in Haiti was terrible and the fact that it struck a country without the money to fix the damage made it even worse. But how did Haiti become so poor? Why didn't it have the money to fix the damage made? Many theories exist, these are some.

1. Many sources say Haiti was once a powerful civilization of Native Americans. The sources also say that once Columbus and the Europeans Haiti went downhill, the Europeans brought disease,death and misery.
2. One source also says Haiti was once a powerful colony but Haiti was on a buying binge. Haitians were buying things that they didn't need and nobody had enough money to by clothes and other necessities. The people with the money went to other places and were never heard from again.
3. The europeans took control of the sugar canes and half the island. The sugar canes were a main source of income for many people.
4. A plane stocked with cocaine crashed and all money was spent trying to stop the use of drugs.