They mostly grew wheat, barley, oats, rye, and corn. because of this, they were basically known as the "Breadbasket". So I believe your answer would most likely be wheat.
-Jacob V. Samuel Adams convinced Paul Revere to make a picture of the Boston Massacre. It wasn't accurate, but Samuel Adams wanted to use what happened in the Boston Massacre to make Colonists even angrier...
Hope it helps! ツ
I assume "Muslim belief system" refers to Islam, the religion, not any specific social construct. There are a lot of inherent elements. One is monotheism: there is only 1 god. Another element is the 5 Pillars of Islam, which give guidance on how to live one's life. Hope this helps.