Question

what are some advantages of isolationism

Answer 1

1. You don't get tangled up in some bloody war. 
2. You don't have to spend a lot of money on other countries problems. 
3. As a government you can focus more on the needs of your countrymen. 
4. You don't have to keep a large military on hair trigger notice. 
5. You're not likely to make enemies out of some random country halfway around the world. 

Answer 2

nonparticipation in any alliances, economic commitments or foreign trade, to avoid diplomacy entanglements with foreign countries