the most significant thing to learn about the differences between social, political and economics systems in the world ???????

Answer 1

Already was on your suggested sites...don't think you can help me on this one...Thank you for trying

Answer 2

"the most significant thing" -- those words indicate that you need to be using your own judgment, forming your own opinion BASED ON WHAT YOU'VE ALREADY LEARNED. You can't find your own opinions on the Internet!!