This is the 9474th most frequent Spanish word.
americanista
A specialist or expert in the study of the Americas, its cultures, history, and peoples.
In this sentence, 'americanista' refers to a historian or enthusiast who specializes in the study of the Americas.
Carlos es americanista porque le encanta estudiar la historia de América.
Carlos is an 'americanist' because he loves studying the history of America.
Here, 'americanista' is used to describe a fan of the Mexican soccer team Club América.
Mi prima es americanista y sigue todos los partidos del Club América.
My cousin is an 'Americanist' and follows all the matches of Club América.
In this instance, 'americanista' is mentioned in a general sense to highlight its contextual versatility.