Answer:
Kept foreigners from interfering.
Explanation:
The Tokugawa shogunate held Japan isolated because they did not want the western influence in their society. The involvement of the British in the Opium War warned Japan to strengthen its borders and political power. The Tokugawa regime focused on political, social and economic affairs.
Isolationism is the term used to describe the foreign policies of Japan during the 17th century from threatening their values and culture.
