Comment: For centuries Japan closed most ports of entry to foreign trade.

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In reply to comment: That's what isolationism (see in situ)

For centuries Japan closed most ports of entry to foreign trade.

This is common for island nations.

Disclaimer: Mark Twain (1835-1910-To be continued) is unlicensed. His river pilot's license went delinquent in 1862. Caution advised. Daily Paul