How did the protestant churches begin?

Origins. Protestants generally trace to the 16th century their separation from the Catholic Church. Mainstream Protestantism began with the Magisterial Reformation, so called because it received support from the magistrates (that is, the civil authorities).

Explanation:

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

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