How did slavery in Haiti contradict the principles of the French Revolution?

Slavery in Haiti started after the arrival of Christopher Columbus on the island in 1492 with the European colonists that followed from Portugal, Spain and France. The practice was devastating to the native population. Following the indigenous Tainos' near decimation from forced labor, disease and war, the Spanish, under advisement of the Catholic priest Bartolomé de las Casas and with the blessing of the Catholic church, began engaging in earnest in the 1600 kidnapped and forced labor of enslaved Africans. During the French colonial period beginning in 1625, the economy of Haiti (then known as Saint-Domingue) was based on slavery, and the practice there was regarded as the most brutal in the world. The Haitian Revolution of 1804, the only successful slave revolt in human history, precipitated the end of slavery not only in Saint-Domingue, but in all French colonies. However, this revolt has only merited a marginal role in the histories of Portuguese and Spanish America. This is a problem as it should hold a much more central place due to the fact that its contribution to independence in the Americas is indisputable. Moreover, it is to this rebellion in Haiti that the struggle for independence in Latin American can be traced to.[1] However, several Haitian leaders following the revolution employed forced labor, believing a plantation-style economy was the only way for Haiti to succeed, and building fortifications to safeguard against attack by the French. During the U.S. occupation between 1915 and 1934, the U.S. military forced Haitians to work building roads for defense against Haitian resistance fighters.

Unpaid labor is still a practice in Haiti. As many as half a million children are unpaid domestic servants called restavek, who routinely suffer physical and sexual abuse. Additionally, human trafficking, including child trafficking is a significant problem in Haiti; trafficked people are brought into, out of, and through Haiti for forced labor, including sex trafficking. The groups most at risk include the poor, women, children, the homeless, and people migrating across the border with the Dominican Republic. The devastating earthquake in 2010 displaced many, rendering them homeless, isolated, and supremely vulnerable to exploitation by traffickers. The chaos following the quake also distracted authorities and hindered efforts to stop trafficking. The government has taken steps to prevent and stop trafficking, ratifying human rights conventions and enacting laws to protect the vulnerable, but enforcement remains difficult. The U.S. State Department's Office to Monitor and Combat Trafficking in Persons placed the country in "Tier 2 Watchlist" in 2017.

Explanation:

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its b they wanted to be able to expand their trade..