yǒu / xiē / lì / shǐ / xué / jiā / bǎ / èr / shí / shì / jì / hòu / bàn / yè / chēng / wéi / Měi / lì / jiān / Zhì / shì有些历史学家把二十世纪后半叶称为美利坚治世。Some historians call the latter half of the twentieth century Pax Americana.