Answer:
The accumulation of fortunes changed after the civil war because the wealth of the northerners increased based on property wealth (real estate) while that of the south reduced drastically due to reliance on personal properties (slaves trade).
Step-by-step explanation:
The changed in fortunes accumulation was result of the type of properties that was owned by wealthiest people in the Northern side and the southerns.
The wealth of the northerners increased after the civil because they have accumulated fortunes in areas of property holdings up to 50% increase while properties owned by southerners fell by a massive 75% due to their wealth majorly build on properties that includes slaves.