SELECT t1.name FROM bridge AS t1 JOIN architect AS t2 ON t1.architect_id  =  t2.id WHERE t2.nationality  =  'American' ORDER BY t1.length_feet
show the name of all bridges that was designed by american archtect, and sort the result by the bridge feet length.
[Schema (values) (types)]: | architecture |  architect : id (text) , name (text) , nationality (text) , gender (text) | bridge : architect_id (text) , id (text) , name (text) , location (text) , length_meters (text) , length_feet (number) | mill : architect_id (text) , id (text) , location (text) , name (text) , type (text) , built_year (number) , notes (number);