What were the conditions in the south and north during the great migration?

The correct answer to this open question is the following.

The conditions in the South and North during the Great Migration were the following.

In the South, most people were farmers and lived in rural areas. As Agriculture became more sophisticated with the use of technology, many farmers lost their jobs. On the other hand, the economic conditions of the North were better. Many industries and factories that offered low paid jobs to workers to operate the machines. That is why almost 6 million black people from the rural areas of the South decided to migrate to the North region of the United States during the Great Migration.  

1) union forces launched a surprise attack.

2) more confederate troops arrived by train.

3) union forces retreated.