A commune is a type of large rural organization introduced in China in 1958. Each commune was organized into progressively larger units: production teams, production brigades, and the commune itself.
The use of submarines made attacking or torpedoing ships easily, that made attacking more effective and reduced the chance of home soldiers getting killed.
Slavery viewpoints played a major role in the Democratic Party split. Slavery in itself is for of injustice where one overpowers the other. It emphasizes that there's definitely a split among people.