Answer:
The String Quartet in F major, Op. 96, nicknamed the American Quartet, is the 12th string quartet composed by Antonín Dvořák. It was written in 1893, during Dvořák's time in the United States. The quartet is one of the most popular in the chamber music repertoire.
The last page of the autograph score with Dvořák's inscription: "Finished on 10 June 1893 in Spillville. Thanks God. I'm satisfied. It went quickly."