In the mid-16th century, the Haijin order (closed-door, isolation policy) was enforced and it strictly forbade all maritime activities in order to prevent contact from foreigners by sea.
The Haijin order (closed-door) was enforced. This was in the mid-16th century. Door was isolation policy. It strictly forbade all maritime activities. This was in the mid-16th century. This was to prevent contact from foreigners by sea.