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Sixth Amendment guarantees a citizen a speedy trial, a fair jury, an attorney if the accused person wants one, and the chance to confront the witnesses who is accusing the defendant of a crime.
In simpler terms, according to this amendment, you are allowed to be trialed in court as soon as possible, receive a jury consisting only of honest, non-corrupt people, a lawyer in the court if you cannot afford, or get one, and the chance to speak to witnesses who are accusing you.