The major similarity between these two documents is that both reflect the idea that there should be limitations on the power of the government. This is an important idea that is one of the major bases of our entire system of government today. The major difference between the two is the degree of democracy that they contemplate. The Magna Carta is really meant as a contract between the king and his nobles, giving the nobles guarantees against the king. By contrast, the Declaration of Independence is a call for equality and rights for all people (or at least all white men). This means the Declaration is far more democratic than the Magna Carta.
The causes were the Ohio River Valley. It was originally owned by the French. But, the British colonists wanted more land because their populations as getting bigger and bigger.
