Based on the clue 'at the mirage hotel these illusionists appear in w...', what is the answer?

Based on the clue 'at the masque he had come like a thief in the nigh...', what is the answer? Based on the clue 'at the merger walter reuther was president of the ...', what is the answer? Based on the clue 'at the mexico city olympics the usas jim hines was...', what is the answer? What is associated with: at the minnesota state fair in 1901 this vice president gave his speak softly big stick speech? Based on the clue 'at the moulin rouge took this french artist to new...', what is the answer? What is associated with: at the mouth of cape fear is old baldy lighthouse this states oldest standing lighthouse built… Based on the clue 'at the mouth of chesapeake bay old dominion', what is the answer? What is associated with: at the mouth of the mississippi river this major class of rock is said to be more than 40000 f…