Question: In what year did the actor whose son starred in "The Son of Captain Blood" become a U.S. citizen?

Context paragraphs:
Commander Blood: Commander Blood is a science fiction adventure game that was developed by Cryo, a French company that also created "Captain Blood" (released in 1988).  Designed to run on MS-DOS, "Commander Blood" was released in 1994.  "Big Bug Bang", the sequel to "Commander Blood", was released in 1996, and was available in French, German and English.

Fortunes of Captain Blood: Fortunes of Captain Blood (1950) is a pirate film directed by Gordon Douglas.  Based on the famous Captain Blood depicted in the original novel and subsequent collections of stories written by Rafael Sabatini, "Fortunes" was produced by Columbia Pictures as yet another remake about the notorious swashbuckler.  The film is complete with daring sword fights, sensational sea battles, intrigue, and a vivacious love interest.  It later spawned a sequel from the same cast and crew only two years later entitled "Captain Pirate".

Captain Blood (1924 film): Captain Blood is a 1924 American silent historical adventure film produced and distributed by The Vitagraph Company of America.  The film is based on the novel, "Captain Blood, His Odyssey", by Rafael Sabatini, and was directed by David Smith, brother of Vitagraph founder Albert E. Smith.  Early silent film hero J. Warren Kerrigan stars along with resident Vitagraph leading actress Jean Paige.

Errol Flynn: Errol Leslie Flynn (20 June 1909 – 14 October 1959) was an Australian-born American actor who achieved fame in Hollywood after 1935.  He was known for his romantic swashbuckler roles in Hollywood films, as well as frequent partnerships with Olivia de Havilland.  He became a U.S. citizen in 1942.

Citizenship Reform Act of 2005: The proposed Citizenship Reform Act of 2005 ( ) was a bill which, if enacted into law, would have amended the Immigration and Nationality Act to limit automatic citizenship at birth to apply only to a child born in the United States who: (1) was born in wedlock to parents either of whom was then a U.S. citizen or national or an alien lawfully admitted for permanent residence who maintained such residence; or (2) was born out of wedlock to a mother who was then a U.S. citizen or national or an alien lawfully admitted for permanent residence who maintained such residence.

Captain Blood (video game): Captain Blood ("L’Arche du Captain Blood" in France) is the name of a French video game from 1988 made by ERE Informatique (soon relabeled with their short-lived "Exxos" label) and released by Infogrames.  It was later re-released in the UK by Players Premier Software.  The title tune is a stripped down version of "Ethnicolor" by Jean Michel Jarre.

Age of Pirates: Captain Blood: Captain Blood, formerly known as Age of Pirates: Captain Blood, is an action-adventure game based on the novels by Rafael Sabatini about the titular Captain Blood.  The player will assume the role of the Captain, following his adventures in 1685 Spanish Main.  This game has been recently rated by the PEGI rating board and is being released by 1C.

The Son of Captain Blood: The Son of Captain Blood is a 1962 Italian/Spanish/US international co-production film.  It is the first starring role in a film for Sean Flynn, the son of Errol Flynn, who played the title character in the 1935 film "Captain Blood".  The film was released in Great Britain in 1963 by Warner-Pathe (in some regions on a double bill with Hammer's "The Scarlet Blade").  Paramount Pictures released the film in the US in 1964 on a double bill with the Jerry Lewis film "The Patsy".

Accidental American: An accidental American is a citizen of a country other than the United States who may also be considered a U.S. citizen under U.S. nationality law but is not aware of having U.S. status, or has only become aware of it recently during adulthood.  Accidental Americans' U.S. citizenship arises due to their parents' ties to the United States rather than their own choices: they may be born in their own country but to one U.S. citizen parent who emigrated from the United States, or they may be born in the U.S. to parents residing in the country temporarily for work or study and then return to their own country in their early childhood, with few if any memories of the United States.  The term may also sometimes be applied to people who definitely are not U.S. citizens but have some other sort of connection with the country, for example green card holders who moved back to their country of origin and let their green cards expire without formally cancelling their U.S. immigration status, or non-U.S. citizens married to Americans abroad.  Such tenuous connections to the United States began to become a more salient issue in the late 2000s due to Internal Revenue Service crackdowns which were ostensibly aimed at tax evaders hiding assets in secrecy jurisdictions but ended up having much broader effects on people with U.S. citizenship who resided in other countries, as well as their families.

Blood's bird of paradise: Blood's bird of paradise, also known as Captain Blood's bird of paradise, is a bird in the family Paradisaeidae that is a hybrid between a raggiana bird of paradise and blue bird of paradise.  It is named after Captain N.B. Blood who obtained the specimen through his travels in the East.

Supporting paragraphs: The Son of Captain Blood Errol Flynn
Answer: 1942