I'd say the key term to respond to is "most concisely and precise".
Economic isolation wouldn't qualify for this. Many economic matters are hidden and frequently blended in with other material.
Border changes allow for a paper to meet the above quoted term requirements.
Re the "other related subjects", consider German's loss of it's colonies.
If you had more time than a seminar, ...say 5-10 years, I'd recommend getting into the spinoff San Remo Conference (1919). The oil industry of the allies got the Middle East oil fields.