In the International trades, trade barriers are common. However, regardless of how some countries may view the trade barriers, the tendency of world trade is still open and free. Besides, some international laws and treaties have regulated that states should promote the freedom of international trade, or it is against the obligations. Therefore, it is necessary to research on why international trade barriers exist and to give some suggestions to solve this problem. This paper conducted a literature review in the reason for international trade barriers. Four angles were being discussed: domestic political, income inequality, national security and culture influence. After examining 30 papers and law provisions, we got some conclusions. Reasons for international trade barriers are diverse, including the protection for states economy, security and the peoples interests. It also takes narrow nationalism and extreme patriotism and populism into consideration. To solve this problem, this paper suggests from the reform of WTO and some changes in the international treaties. On the other hand, this paper also has some advice to states to solve their domestic conflicts.
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