This is the 669th most frequent Croatian word.
američkog
"Of American" (possessive adjective).
Here, 'američkog' appears in the genitive singular masculine form, modifying 'novinara' (journalist) to indicate nationality or belonging.
On je pročitao članak američkog novinara.
He read an article by an American journalist.
The word 'američkog' is in the genitive singular masculine form and is used here as an adjective describing 'slikarstva' (painting) to denote its origin or cultural association.
Posjetila je muzej američkog slikarstva.
She visited the museum of American painting.
In this case, 'američkog' serves as an adjective describing 'podrijetla' (origin), indicating the quality or geographical characteristic.