Study of American southern culture in the first half of 20th century 并列正题名：Study of American southern culture in the first half of 20th century Study of western visual culture in the early 20th century The development of Marxism in western countries in the first half of the 20th century prospect of women's art movement in the first half of the 20th century 并列题名：Study of western visual culture in the early 20th century History of Chinese historiography in the second half of 20th century Study of American decolonization policy in the 20th century varieties and patterns of machine silk weaving in the first half of the 20th century The development of Marxism in western countries in the second half of the 20th century