Question: The main artifact at the USS "Iowa" Museum served in what war?

Context paragraphs:
Spurlock Museum: The William R. and Clarice V. Spurlock Museum, better known as the Spurlock Museum, is an ethnographic museum at the University of Illinois at Urbana-Champaign.  The Spurlock Museum's permanent collection includes portions of collections from other museums and units on the Urbana-Champaign campus such as cultural artifacts from the Museum of Natural History and Department of Anthropology as well as historic clothing from the Bevier Collection of the College of Agricultural, Consumer and Environmental Sciences.  The Museum also holds objects donated by other institutions and private individuals.  With approximately 51,000 objects in its artifact collection, the Spurlock Museum at the University of Illinois at Urbana-Champaign collects, preserves, documents, exhibits, and studies objects of cultural heritage.  The Museum’s main galleries, highlighting the ancient Mediterranean, modern Africa, ancient Egypt, Mesopotamia, East Asia, Oceania, Europe, and the Americas, celebrate the diversity of cultures through time and across the globe.

Edmund Root: Edmund Spence Root (December 27, 1881 – February 27, 1961) was a United States Navy Captain who served as the 34th Naval Governor of Guam.  He graduated from the United States Naval Academy in 1905, serving on many ships as an ensign.  He served as the inaugural commanding officer of two ships: the USS "Rizal" and the USS "Astoria" .  He served during World War I as commander of the U-boat hunting USS "Rowan", for which he received a letter of commendation.  As governor, he generated controversy by expelling 112 Japanese laborers from Guam.  The Guam Museum also opened during his term of office.

National World War I Museum and Memorial: The National World War I Museum and Memorial of the United States is located in Kansas City, Missouri.  Opened to the public as the Liberty Memorial museum in 1926, it was designated in 2004 by the United States Congress as America's official museum dedicated to World War I.  The Museum and Memorial are managed by a non-profit organization in cooperation with the Kansas City Board of Parks and Recreation Commissioners.  The museum reopened to the public in December 2006 with an expanded, award-winning facility to exhibit an artifact collection that began in 1920.  The National World War I Museum tells the story of the Great War and related global events from their origins before 1914 through the 1918 armistice and 1919 Paris Peace Conference.  Visitors enter the exhibit space within the 32,000 sqft facility across a glass bridge above a field of 9,000 red poppies, each one representing 1,000 combatant deaths.

USS Iowa Museum: The USS "Iowa" Museum is a maritime museum located at the Port of Los Angeles in San Pedro, Los Angeles, California, United States.  The museum's main artifact is the USS "Iowa" (BB-61), lead ship of the "Iowa" class of battleships.

Richard Allen Cultural Center: The Richard Allen Cultural Center opened in 1992 to highlight African-American history in Leavenworth, Kansas.  In 1992, the museum opened in the former home of U.S. Army Captain William Bly, a Buffalo Soldier during World War I.  The home is decorated to look as it would have in the early 1900s.  In 2002, an addition was built to the front of the original home to display more items teaching about African-American history in Kansas.  One display includes prints of original photographic plate negatives donated to the museum, called the Black Dignity Photos from the Mary Everhard collection.  The photographs are African-American pioneers who lived in and around the Leavenworth area from 1870s to 1920s.  Other items include military artifacts from African-American soldiers who served on Fort Leavenworth, including Colin Powell.  The Richard Allen Cultural Center also contains a Ku Klux Klan costume and photographs depicting KKK activities in Leavenworth.  One artifact is a news article discussing the public lynching of an African-American citizen of Leavenworth, Fred Alexander.  The Richard Allen Cultural Center seeks to preserve these pieces of Leavenworth, Kansas history so that they are not forgotten.

USS Iowa (BB-61): USS "Iowa" (BB-61) is the lead ship of her class of battleship and the fourth in the United States Navy to be named after the state of Iowa.  Owing to the cancellation of the "Montana"-class battleship s, "Iowa" is the last lead ship of any class of United States battleships and was the only ship of her class to have served in the Atlantic Ocean during World War II.

Charles W. Rush: Charles "Charlie" W. Rush, Jr. (March 18, 1919 – February 27, 2015) was a retired United States Navy captain, who served during World War II and the Korean War.  During World War II, Rush saved the entire submarine crew of the USS Billfish from a November 1943 depth charge attack by three Japanese destroyers.  His actions remained hidden for nearly 60 years before he was honored with the Navy Cross in 2002 for his heroic actions.  Rush served on the USS Thresher, USS Carbonero, and USS Billfish and served in command of the submarines USS Queenfish and USS Blackfin before retiring from the Navy in 1961.  Rush developed a number of submarine-launched missiles, including a notable high-speed wake-less torpedo.

South Carolina State Museum: The South Carolina State Museum is a state-of-the-art facility featuring four floors of permanent and changing exhibits, a digital dome planetarium, 4D interactive theater and an observatory.  The State Museum, the largest and most comprehensive museum in the state, is located along the banks of the Congaree River in downtown Columbia, South Carolina.  Positioned on an old shipping canal that dates back to pre-Civil War times, the museum is widely recognized as a resource for South Carolina history and lifestyle.  The museum opened on October 29th, 1988 and is housed in what it calls its largest artifact, the former Columbia Mills Building, listed on the National Register of Historic Places in 1982.  When the mill opened in 1894, manufacturing cotton duck cloth (a canvas-like material), it was the first totally electric textile mill in the world.  It was also the first major industrial installation for the General Electric corporation.  On certain levels of the museum, the original flooring has been kept intact, distinguishable by hundreds of textile brads and rings (that carried the threads during the spinning process) that became embedded in the floor while it was still being used as a mill.

Somali Museum of Minnesota: The Somali Museum of Minnesota (also known as the Somali Artifact and Cultural Museum) is a cultural institution in Minneapolis, Minnesota.  (See: List of museums in Minnesota.)  The Minneapolis/St.  Paul metro area is home to the largest Somali immigrant and refugee population in the United States, after civil war in Somalia prompted large-scale displacement of the Somali people... The Somali Museum of Minnesota presents a collection of around 700 traditional nomadic artifacts from Somalia, as well as educational programming about Somali culture, arts events, and cross-cultural activities.  It may now be the only museum in the world dedicated to preserving Somali culture and traditions.

Marine Corps Museum: The Marine Corps Museum was located on the first floor of the Marine Corps Historical Society in Building 58 of the Washington Navy Yard, 9th and M Streets (southeast), Washington, D.C. It housed a wide variety of exhibits with artifacts relating to the history of the U.S. Marines.  It also contained a collection of art relating to the Marines and a historical Time Tunnel.  For many years, the Marine Corps Museum served as an important center for preserving and showcasing the Marine Corps legacy.  The museum closed on July 1, 2005 during the establishment of the National Museum of the Marine Corps.

Supporting paragraphs: USS Iowa Museum USS Iowa (BB-61)
Answer: World War II