Solomon Northup's Twelve Years a Slave provided Northerners 15 (2 points)
a. a extensive way to show the positives in slavery.
b. a rare glimpse into the violence and degradation of the South's slave labor system.
c. a intensive view of what the country would be like without slavery.
d. a one-sided view by a white southern plantation owner.

B. A rare glimpse into the violence and degradation of the South's slave labor system.

Explanation:

Solomon's book had been a revolutionary and quite gruesome exposing on the horrors of slavery of which was very still prevalent when he escaped from his masters in the 1850s.

Have a great day!

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.