The confederacy passed the conscription act because the army needed more people to serve in the army as the number of volunteers declines and the number of casualties increased.
Explanation
At the beginning of the civil war,both the confederate states and the union army did not use conscription but in the later years the war took a violent turn.People hesitated to join the army and the number of soldiers in the confederate army decreased visibly.
In order to avoid defeat in the war, the confederate army wanted more men to join it and they enacted the act of conscription which made it necessary for all white men between the age of 18 and 35 to serve in the confederate army if called.
The correct answer is - natural selection.
This is a typical case of natural selection, where we have a group of people that have similar physical traits, that are selected and than isolated from any external influence, so with interbreeding they manage to keep their physical traits for generations to come and thus create a population that resembles their initial ancestors.
It means it’s better to be thankful for what you have. that having something, even if it’s small is better than losing it in order to gain something else.