¿Qué variable(s) permite(n) explicar el desarrollo de los actuales procesos migratorios? Marca más de una alternativa. Las mejoras en los sistemas de transporte. La atracción que ejercen los centros urbanos. Las expectativas de trabajo que causan las ciudades

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the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.

the church governed the society after the empire fell.   constantine took charge of rome and ended the confusion which had over religion and made christianity as the only religion and that started ruling the roman empire. he also divided the empire into two and fortified the eastern part.   he ruled the eastern part.