so to answer your question, The Magna Carta is so important because it established the principle that everyone is subject to the law, even the king, and guarantees the rights of individuals, the right to justice and the right to a fair trial.
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Impeachment means the removal of the president from office.
C IS THE ANSWER HOPE I HELPED :)
Stephen F. Austin aka (The Father of Texas) had land dispute with Mexico i think.
Any more details on the question I’m a bit confused.