CREATE TABLE table_name_50 (position VARCHAR(255), player VARCHAR(255), nationality VARCHAR(255), jersey_number_s_ VARCHAR(255))
What is Postition, when Nationality is United States, when Jersey Number(s) is 12, and when Player is Tom Black Category:Articles With hCards?
    
SQL: SELECT position FROM table_name_50 WHERE nationality = "united states" AND jersey_number_s_ = "12" AND player = "tom black category:articles with hcards"