What is associated with: after 182 years the post office department ceased to exist in 1971 was replaced by this agency?

What is associated with: after 1710 swift flipped his whig joined this conservative party that was gaining power? Based on the clue 'after 18 games he defeated viswanathan anand 10 12...', what is the answer? What is associated with: after 18 years in captivity starting at age 11 she justly called her 2011 memoir a stolen life? What is associated with: after 18 years in exile he returned to argentina in 1973? What is associated with: after 1875 the labrador type of this bird was no longer feeling so daffy? What is associated with: after 1923 lawrence used this surname as an alias it was also the surname of his friend the no… What is associated with: after 1936 serge koussevitzky conducted the berkshire music festival at tanglewood in this sta… What is associated with: after 1946 this berlin prison on the wilhelmstrasse housed nazi war criminals?