<Li> La decena trágica </Li> <Li> Plan of Guadalupe </Li> <Li> Occupation of Veracruz </Li> <Tr> <Td> Modern (show) <Ul> <Li> Maximato (1928--1934) </Li> <Li> Petroleum nationalization </Li> <Li> Mexican miracle </Li> <Li> Students of 1968 </Li> <Li> La Década Perdida </Li> <Li> 1982 economic crisis </Li> <Li> Chiapas conflict </Li> <Li> Mexican peso crisis </Li> <Li> PRI downfall </Li> <Li> Mexican Drug War </Li> </Ul> </Td> </Tr>

2. what were the factors which led to the collapse of the aztec empire