Based on the clue 'at the united nations who', what is the answer?

Based on the clue 'at the turn of the century railroads began to hire...', what is the answer? Based on the clue 'at the turn of the century the area was divided in...', what is the answer? Based on the clue 'at the u of richmond this retired general stormed ...', what is the answer? Based on the clue 'at the uffizi in florence you can drink in caravag...', what is the answer? Based on the clue 'at the univ of wisconsin you can take a course ana...', what is the answer? What is associated with: at the university of bonn in 1836 he was wounded in a duel with a member of an aristocratic pr… What is associated with: at the urging of this general now on the 5 peso note argentina declared its independence from… What is associated with: at the urging of this president the department of education became a cabinet department in 197…