The dominant political system in the Middle Ages was known as Feudalism. It was when nobility held lands for the crown and in turn pledged military service to the Crown. Vassals were servants to the nobles and serfs worked the land and gave the nobles a share of the produce, in exchange for Miltary protection.
British troops fired on a crowd of colonists in boston because they were afraid for their lives that the colonists would start to try to kill them. They were also ordered to by their frightened superiors
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World War I popularized the use of the machine gun—capable of bringing down row after row of soldiers from a distance on the battlefield. This weapon, along with barbed wire and mines, made movement across open land both difficult and dangerous. so trench warfare was born
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