SELECT DISTINCT T1.type FROM mill AS T1 JOIN architect AS t2 ON T1.architect_id = T2.id WHERE T2.nationality = 'American' OR T2.nationality = 'Canadian'
Apa saja jenis pabrik yang berbeda yang dibangun oleh arsitek Amerika atau Kanada?
CREATE TABLE architect (Id VARCHAR); CREATE TABLE mill (type VARCHAR, architect_id VARCHAR)