It was the<span> Allies troops. </span>
The expansion of railroads created more ways for things such as general goods to be shipped elsewhere to buyers or companies. (Hope this helps a bit, sorry for such a short answer.)
Answer: What exactly are you asking?
Explanation:
The main reason was the South wanted to preserve slavery. The North wanted to abolish it. If you want some other reasons than slavery, let me know, and I will do my best to add more to this answer.
Matthew's Gospel was to Jewish Christian
Mark's Gospel was to a non Jewish gentile Christians undergoing persecution
Luke was to largely gentile Christians (world)