Question: In what year did the writer of the music of the Firebrand of Florence become a United States citizen?

Context paragraphs:
The Firebrand of Florence: The Firebrand of Florence is a Broadway musical in two acts, written by Kurt Weill (music), Ira Gershwin (lyrics), and Edwin Justus Mayer and Gershwin, based on Mayer's play.  The show opened at the Alvin Theatre (now the Neil Simon) on March 22, 1945 and closed on April 28 of the same year after 43 performances.  The original production was directed by John Murray Anderson and conducted by Maurice Abravanel; it featured Lotte Lenya as Duchess.

Michael P. Fay: Michael Peter Fay (born May 30, 1975), better known simply as Michael Fay, is a United States citizen who was the subject of international attention in 1994 when he was sentenced to six strokes of the cane in Singapore for theft and vandalism at age 18.  Although caning is a routine court sentence in Singapore, its barbarity caused controversy in the United States, and Fay's case was believed to be the first caning involving an American citizen.  The number of cane strokes in Fay's sentence was ultimately reduced from six to four after United States officials requested leniency.

Barbara Sanchez-Kane: Barbara Sanchez-Kane is a menswear fashion designer from Mérida, Mexico.  Her mother is a United States citizen.  She completed a degree from Universidad Anahuac in industrial engineering, in 2015 and later went on to complete another in fashion design from Polimoda in Florence, Italy.  Barbara is a feminist and advocate for gender equality.  She has spoken out against U.S. President Donald Trump for his anti-Mexican policies.  Sanchez-Kane came out as lesbian to her mother and her favorite piece references this time in her life and reads "Mom Approves" on the back of the jacket.

Honorary citizen of the United States: A person of exceptional merit, generally a non-United States citizen, may be declared an honorary citizen of the United States by an Act of Congress or by a proclamation issued by the President of the United States, pursuant to authorization granted by Congress.

Lobo Nocho: Ernest Leroy Nocho (14 January 1919 – 4 September 1997), better known by his stage name Lobo Nocho, was an African-American émigré jazz singer and painter in Europe.  A former United States citizen, he settled in Europe after serving in World War II, and renounced his citizenship in 1950 to become a French citizen.  He was later widely noted for his romantic links to Winston Churchill's daughter Sarah Churchill.

Hamid and Umer Hayat: Hamid Hayat (born September 10, 1983) is a United States citizen of Pakistani descent from Lodi, California.  His father, Umer Hayat (born January 5, 1958), was born in Pakistan and emigrated to the United States in 1976; he is a naturalized American citizen.  Together they were the subjects of the first terrorism trial in the state of California.  Both were alleged to be part of, or associated with, a terrorist sleeper cell.

Kurt Weill: Kurt Julian Weill (March 2, 1900April 3, 1950) was a German composer, active from the 1920s in his native country, and in his later years in the United States.  He was a leading composer for the stage who was best known for his fruitful collaborations with Bertolt Brecht.  With Brecht, he developed productions such as his best-known work "The Threepenny Opera", which included the ballad "Mack the Knife".  Weill held the ideal of writing music that served a socially useful purpose.  He also wrote several works for the concert hall.  He became a United States citizen on August 27, 1943.

Dorothy Gould Burns: Dorothy Gould Burns (1904 – July 6, 1969), known as Countess de Graffenried de Villars, was the subject of a court case concerning when a United States citizen who lives overseas has undergone expatriation or has become a dual national and thus still subject to United States taxation.

Form I-130: Form I-130, Petition for Alien Relative is a form submitted to the United States Citizenship and Immigration Services (or, in the rare case of Direct Consular Filing, to a US consulate or embassy abroad) by a United States citizen or Lawful Permanent Resident petitioning for an immediate or close relative (who is not currently a United States citizen or lawful permanent resident) intending to immigrate to the United States.  It is one of numerous USCIS immigration forms.  As with all USCIS petitions, the person who submits the petition is called the petitioner and the relative on whose behalf the petition is made is called the beneficiary.  The USCIS officer who evaluates the petition is called the adjudicator.

K-1 visa: A K-1 visa is a visa issued to the fiancé or fiancée of a United States citizen to enter the United States.  A K-1 visa requires a foreigner to marry his or her U.S. citizen petitioner within 90 days of entry, or depart the United States.  Once the couple marries, the foreign citizen can adjust status to become a lawful permanent resident of the United States (Green Card holder).  Although a K-1 visa is legally classified as a non-immigrant visa, it usually leads to important immigration benefits and is therefore often processed by the Immigrant Visa section of United States embassies and consulates worldwide.

Supporting paragraphs: The Firebrand of Florence Kurt Weill
Answer: 1943