Answer:
To teach children Puritan virtues or common values and how to read the Bible.
Explanation:
After the settling of English colonists. The English people decided that it is best to train their children with education.
They started with the establishment of primary schools in the present-day state of Massachusetts.
During this period, the main reason colonies' mandate that children learn to read is "to teach children Puritan virtues or common values and how to read the Bible."