So Serbia has been expanding rapidly. Why?
1. Serbia is a very powerful country
A. They have a strong government compared to Norway very stronger
B. They have a very strong military comapred to Norway in which Norway is somewhat weak while Serbia is very powerful
2. Citizens
A. Serbia has a higher amount of citizens comapred to norway 
B. Norway is often overlooked and Serbia is a large economic power
3. Ecomony
A. Norway has about no economic power
B. AS stated earlier Serbia is a large economic power
4. size
A. Norway is a very small country
B. Serbia is a very large and heavily pwerful country

This shows a high power imblance between Norway and Serbia