The growing societal and economic unrest of the late-1800s was MOST influenced by?

a widening income gap between industrial laborers and factory bosses.

The final decades of the 19th century saw a widening income gap between industrial laborers and factory bosses.. The poor never really got a chance to better their condition, despite working many hours at often life-threatening jobs. However, industrial bosses, especially factory owners, often became incredibly wealthy at the same time their laborers were practically starving to death.