In the mid-20th century, the state experienced a significant rise in population, which outstripped local resources, especially land in the highland areas. Since the 1930s, many indigenous and mestizos have migrated from the highland areas into the Lacandon Jungle with the populations of Altamirano, Las Margaritas, Ocosingo and Palenque rising from less than 11,000 in 1920 to over 376,000 in 2000. These migrants came to the jungle area to clear forest and grow crops and raise livestock, especially cattle. Economic development in general raised the output of the state, especially in agriculture, but it had the effect of deforesting many areas, especially the Lacandon. Added to this was there were still serf like conditions for many workers and insufficient educational infrastructure. Population continued to increase faster than the economy could absorb. There were some attempts to resettle peasant farmers onto non cultivated lands, but they were met with resistance. President Gustavo Díaz Ordaz awarded a land grant to the town of Venustiano Carranza in 1967, but that land was already being used by cattle-ranchers who refused to leave. The peasants tried to take over the land anyway, but when violence broke out, they were forcibly removed. In Chiapas poor farmland and severe poverty afflict the Mayan Indians which led to unsuccessful non violent protests and eventually armed struggle started by the Zapatista National Liberation Army in January 1994.