This may have been due to the brief existence of the Federal Republic of Central America[1] in the antebellum period, which was often called the United States o

This may have been due to the brief existence of the Federal Republic of Central America[1] in the antebellum period, which was often called the United States of Central America[2] [1] https://en.wikipedia.org/wiki/Federal_Republic_of_Central_America https://en.wikipedia.org/wiki/Federal_Republic_of_Central_Am... [2] If you play the Paradox Interactive video games Victoria or Victoria II, it is named the United States of Central America there as well.