This is the 9953rd most frequent Russian word.
американцев
"Americans" (plural form, referring to people from the United States).
'американцев' refers to a group of American individuals, used in the accusative plural case as the direct object of the verb 'встретили' (met).
Мы встретили группу американцев в парке.
We met a group of Americans in the park.
'американцев' refers to the opinions of Americans, used in the genitive plural case to express possession or relationship with the opinion.
Мнение американцев важно в этом вопросе.
The opinion of Americans is important in this matter.
'американцев' refers to the history related to Americans, used in the genitive plural case to indicate the relationship with 'историю' (history).