Volcanoes erupt because of density and pressure. The lower density of the magma relative to the surrounding rocks causes it to rise.
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- Jose de San Martin (1778 - 1850) - Argentine general, leader of South America's uprising against Spanish governance. He's a national hero in Argentina, Chile and Peru.
- Miguel Hidalgo (1753 - 1811) - a Catholic priest from Mexico, who have taken leadership of Mexican War of Independence. He became one of the primary causes of the uprising against Spanish governance.
- Toussaint L’Ouverture (1743 - 1803) - leader of the uprising against French governance on Haiti. He changed the course of slavery in the New World making slaves independent on Haiti.
The plague stopped the movement plus lack of technology
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