Even though it was written in 1215, magna carta is an important document to the american legal system because it

Magna Carta is important document to American legal system because it listed the rights of Englishmen and the U.S. Constitution is based on English law forms the basis of contract law .

Explanation:

Magna Carta was an inspiration for the Americans in 18th century in U.S. They saw it as a powerful and assertive means to curb the power of despotic and oppressive ruler by getting the declaration of their rights.

Therefore, American Constitutional Grundnorms like idea of supremacy of law, representative government, judicial review, etc. have its genesis in Magna Carta. Hence, this document which was written in 1215 had a great influence on the Constitution of U.S.

Magna Carta served as the foundation as well as the inspiration for the United State Bill of rights which has guaranteed the citizens certain fundamental rights like protection from unlawful search, protection of life, liberty and property, right to speedy trial, etc.