Why do nations establish trade barriers

It is because it helps to protect that same industry in its own country.

Hope this helped ;)

Uh.. what is that supposed to mean?

•don’t over think about math, just breath, be calm
• practice practice practice! it will get better, even if it’s hard
• try some flash cards to u remember
• don’t get yourself distracted, be focused or your gonna get lost!
hope this ! : )