The difficulties they struggled with was the Bubonic plague also known as the Black Death caused by bacterium yersinia pestis and civil war.
Answer:
I don't know if this is true or not but I can only think of Donald Trump. Sorry if this is wrong
D. The poor living conditions of the working class in industrial cities
Explanation:
Lincoln Steffens is remembered for his work on the corruption and the life of working class in industrial America which he compiled in his book called the Shame of the City.
It delved into the deep seated corruption and systemic exploitation which was rampant in the big industries of the country which were booming with profits but were designed to exploit the common man.
His study on the exploitation on the working class was instrumental in getting more worker rights for them.
They created paper and a new outlook on life
It allowed Missouri and then Maine (which also applied for statehood) to become states. A lot of states were on the edge on wether to admit or not allow a state that allows slavery into the states. In the end - both were admitted and became states. However, Missouri was left as a slave state and Maine was set as a free state.
