Besides giving young men a job, one of the primary purposes of Civilian Conservation Corps was preservation or the conservation of the resources that were found naturally. This included the conservation of the lands and also creating new forests by planting trees. I hope the answer comes to your help.
The Song Dynasty used rockets, which drove off Mongol siege attacks. The Mongol weaponry was pretty standard.
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Manorialism, also called manorial system, seignorialism, or seignorial<span> system, political, economic, and social system by which the peasants of medieval Europe were rendered dependent on their land and on their lord.</span>