What types of labor systems were used in the Americas? Did systems of unfree labor serve more than an economic function?

according to worldatlas.com, the u.s. has an 86% literacy rate.

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.