The western world ...
The United States.

APA Citation

[Fergus, H. (183845). The western world ..: The United States. A new ed. London: Longman, Orme, Brown, Green, & Longmans [etc.].

MLA Citation

[Fergus, Henry]. The Western World ..: The United States. A new ed. London: Longman, Orme, Brown, Green, & Longmans [etc.], 183845.

Warning: These citations may not always be complete (especially for serials).