The correct answer would be letter "B", the widespread growth of publishing.
Mass culture is the name given to people being exposed to same set of ideas and values though the same media sources. That started to occur in the late 19th century, with the rise in mass advertising and the tabloid newspapers, as well as the increasing number of popular magazines.
Copperheads, were very vocally opposed to the civil war they wanted a peace agreement with the confederates
They wanted colonies so that they could convert the colonies to christianity.