Answer:
The Northern states believed that owning people (slaves) was wrong so they wanted to put a stop to it but the southern states refused because they saw slavery as a gain because they wouldn't have to pay the slaves that work for them. So the 2 sides despised each other which led up to the war
Explanation:
economic idk specifically what u mean by effective but in effective in damage there was a lot to be rebuilt after the war and the cost of bullets and guns was bad to
I think it crashed into something it was an iceberg i think then everyone was ded
The dead were put in the trenches until they can be buried.
