The Japanese policy of near-isolation ended in 1854 because japan:

To agree to the demands of the Untied States

Explanation:

The Japanese, because of their years of isolation, had no navy with which to defend themselves, and thus they had to agree to the demands of the United States. In 1854, the Treaty of Kanagawa was signed which permitted trade and opened Japanese ports to merchant ships.

a.   it resulted in widespread unemployment.

b - those executed came from every social and economic class