Following Dessaline's assassination, another of Toussaint's black generals, Henri Christophe, succeeded his in control of the north, while Alexandre Pétion presided over mulatto rule in the south. There were large differences in governance between Petion's republic, and what would eventually become Christophe's kingdom. While the southern republic did not have as much focus on economic development, and put more attention on liberal land distribution and education, the northern kingdom went on to become relatively wealthy, though wealth distribution was disputed. As a result of temporary trade agreements between Christophe, the United States, and British colonies, Christophe was able to rebuild the northern region. There were large investments in education and public works, military infrastructure, and many chateaux, the most notable being the Sans Souci palace in Milot. However, much like his predecessors, this was achieved through forced labor which ultimately led to his downfall. Contrarily, Petion was beloved by his people, but despised by his northern counterpart. A major effort by Christophe to take Port-au-Prince in mid–1812 failed. The mulattoes were harassed by a pocket of black rebellion in their rear from February 1807 to May 1819. A black leader named Goman kept alive the angry spirit of Dessalines in the southern mountains of the Grand-Anse, resisting several mulatto punitive expeditions. Finally, in 1819, the new mulatto leader, Jean-Pierre Boyer, sent six regiments into the Grand-Anse to ferret out Goman. The black rebel was trapped and shot off a 1,000-foot-high cliff. In 1820, the island nation was finally reunified when Christophe, ill and surrounded by new rebellions, killed himself. Boyer with 20,000 troops marched into Cap-Haïtien, the northern capital, shortly afterward to establish his power over all of Haiti. Not too long after, Boyer was able to secure cooperation with the general of the neighboring Spanish Haiti, and in February 1822 began a 22 year long unification with the eastern state.