What was the Bloody Sunday?

Bloody Sunday. On the morning of Sunday 30 January 1972, around ten thousand people gathered in Londonderry for a civil rights march. The British Army had sealed off the original route so the march organisers led most of the demonstrators towards 'Free Derry Corner' in the nationalist Bogside area of the city.

Explanation:

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.