Question: What star of Silver River became a U.S. citizen in 1942?

Context paragraphs:
Big Silver Creek: The Silver River, aka the Big Silver River and Big Silver Creek, or zácta in the St'at'imcets language of the In-SHUCK-ch people, is the second-largest stream entering Harrison Lake in the Lower Mainland of British Columbia, Canada (the largest is the Lillooet River, at the head of the lake).  Rising in the central Lillooet Ranges to the east of the lake, it is approximately 40 km in length; its main tributary is the Little Silver River.  A logging camp at its mouth was once a thriving community named Silver River.

Silver River (Ireland): The Silver River (Irish: "Abhainn Airgid" ) flows from the Slieve Bloom Mountains in the south of County Offaly in central Ireland.  The village of Cadamstown, on the river, is home of The Silver River Geological Reserve.

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.

M-26–Silver River Culvert: The M-26–Silver River Culvert is a highway bridge located on M-26 over the Silver River in Eagle Harbor Township, Michigan.  The Keweenaw County Road Commission built the bridge in 1930; they also built the US 41–Fanny Hooe Creek Bridge and the M-26–Cedar Creek Culvert around the same time.  The M-26–Silver River Culvert was listed on the National Register of Historic Places in 1999.

James River (Texas): The James River is located in Kimble and Mason counties, in the U.S. state of Texas.  The Llano River in Mason County is the location of the mouth of the James River, and it flows southeast for 36½ miles past the Kimble County ghost town of Noxville.  The river intersects with the James River Spring and also with the Little Devils River in southeastern Kimble County.  The valleys along the James River became sites for 19th-century European settlements.  The river is a destination for outdoor enthusiasts of whitewater kayaking and rafting.

Silver River (film): Silver River is a 1948 western film directed by Raoul Walsh and starring Errol Flynn and Ann Sheridan.  The film is based on a Stephen Longstreet novel.

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.

Silver River, British Columbia: Silver River was a logging camp on the east side of Harrison Lake in British Columbia, Canada, located at the mouth of Big Silver Creek, which is also unofficially called the Silver River or Big Silver River.

Silver Springs State Park: Silver Springs State Park, formerly known as Silver River State Park, is a Florida State Park located on the Silver River in Marion County.  The park contains Silver Springs, Florida's first tourist attraction.

Silver River Museum: The Silver River Museum and Environmental Education Center is a nature museum in Silver Springs State Park in Silver Springs, Florida, near Ocala.  The museum is named after the Silver River, which flows through the park.

Supporting paragraphs: Silver River (film) Errol Flynn
Answer: Errol Leslie Flynn