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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Two of the most major outcomes resulting from the Crusades were that the King's authority increased vastly and the Europeans learned new and more things from the Muslims that they had encountered and come across. Many of the peasants and farmers left their land to go fight in the wars, and wen they died, their land was handed over to the king.
Two mountain ranges, the Alps and the Apennines, helped to protect Rome from invasion. The Apennines divide the Italian peninsula in half and, according to SPQR Online, allowed the Romans to mass forces for counter-attack whenever they were threatened.
The Sacco and Vanzetti case happened in the 1920s, both men were accused and convicted of murdering a guard and a paymaster on an armed robbery. They were electrocuted. The case got national attention because many people believed they were innocent and were only being sued because they were anarchists and defended the left-wing movement. With the rise of the anti-communist movement in America, they became targets. In 1977 the Governor of Massachusetts proclaimed that Sacco and Vanzetti did not receive a fair trial.
The answer to your question is C.