In what year did the norman invasion begin?

1066 AD

Explanation:

It was in the year 1066 that the Norman invasion began. The Norman invasion was the military conquest of England (Britain) by William, the Duke of Normandy. The forces of the William-the conqueror decisively defeated the English in the Battle of Hastings and thus conquered and occupied the territory of England.

answer; i believe the two groups were irish immigrants and chinese immigrants;