What is associated with: a portion of this avenue between the capitol the white house was designated a national historic site in 1965?

Based on the clue 'a portion maybe of cake', what is the answer? Based on the clue 'a portion of a journey its also the part of a rela...', what is the answer? Based on the clue 'a portion of crater lake including wizard island', what is the answer? Based on the clue 'a portion of thailands border with laos is provide...', what is the answer? Based on the clue 'a portion of this heroic emanuel leutze masterpiec...', what is the answer? Based on the clue 'a portion of this scroll whose name means law is r...', what is the answer? Based on the clue 'a portion or a state of harmony', what is the answer? Based on the clue 'a portrait of her painted by her husband hangs in ...', what is the answer?