The main way in which clause 39 of the Magna Carta was influential to the American Revolution was that it prohibits people from being arrested or punished without due process of the law, which inspired the Founding Fathers, who were adamant about ensuring personal freedom. The main way in which Clause 39 of the Magna Carta was influential to the American Revolution was that it places limits on the power of the king, especially with regard to the King's ability to arrest people--meaning that the Founding Fathers drew on this as inspiration to show that they too had power.
The Magna Carta has been fundamental and inspirational for the american revolution and the subsequent stages of the new nation, specially in highlighting the <em>citizen's individual rights</em> and limiting the king's power and submitting it to the law, and with this pushing forward to the foundation of the <em>right to justice and the right to fair trial</em>, in order to avoid the abusive use of power and pave the way to a more egalitarian society.