Question: What type of wood was the boat made out of that was to be built on RMS "Queen Mary" occupied land in Long Beach, California?

Context paragraphs:
Long Beach Convention and Entertainment Center: The Long Beach Convention and Entertainment Center is a convention center located in Long Beach, California.  Built on the former site of the Long Beach Municipal Auditorium; the venue is composed of the Long Beach Convention Center, Long Beach Arena and the Long Beach Performing Arts Center.

Thomas Clark (Long Beach): Thomas Joseph Clark, Jr. (born July 13, 1926) is an American politician.  He served as mayor of Long Beach, California from 1975 to 1980 and from 1982 to 1984, as elected by the Long Beach city council.  He is also a former member of the city council and its longest serving member, serving from 1965 to 1996.  He has also served on the Long Beach City College Board of Trustees (from 1998 to 2013), and as president of the Community College League of California (CCLC) and the California Community College Trustee (CCCT) Board.  Clark was born in San Diego and moved to Long Beach in 1933.  He is an optometrist, and alumnus of Long Beach City College and the University of California at Berkeley.  He retired from his optometry practice in 1993, and from public office in 2014.

Hughes H-4 Hercules: The Hughes H-4 Hercules (also known as the Spruce Goose; registration NX37602) is a prototype strategic airlift flying boat designed and built by the Hughes Aircraft Company.  Intended as a transatlantic flight transport for use during World War II, it was not completed in time to be used in the war.  The aircraft made only one brief flight on November 2, 1947, and the project never advanced beyond the single example produced.  Built from wood because of wartime restrictions on the use of aluminum and concerns about weight, it was nicknamed by critics the "Spruce Goose", although it was made almost entirely of birch.  The Hercules is the largest flying boat ever built, and it has the largest wingspan of any aircraft that has ever flown.  It remains in good condition and is on display at the Evergreen Aviation & Space Museum in McMinnville, Oregon, United States.

Long Beach Boulevard station: Long Beach Boulevard or Long Beach/I-105 is a Los Angeles County Metro Rail station on the Green Line.  It is located in the center median of Century Freeway at the interchange with Long Beach Boulevard in Lynwood, California.  It is not necessarily named for the city of Long Beach, California (served by the Blue Line) as Metro Rail usually names most of their stations after the nearest major cross streets.  In this case, the station, located in Lynwood, is named for Long Beach Boulevard which indeed travels down to Long Beach.  The original name for this station was Long Beach Blvd/I-105 and it may still be used in some places.

Layout hunting: Layout boat hunting is a sub specialty of traditional waterfowl hunting which is done in a low-profile un-motorized boat made of a unique design to allow hunter to maintain a close position to the water in order to conceal them in open water.  This is a sport with a long history going back to market hunters and punt boats mounted with small cannons.  The main focus of the layout boat is to put the hunter very close to the decoys if not in them for additional concealment.  This makes for very dramatic hunting scenarios where a decoying bird comes extremely close to the hunter and boat.

RMS Queen Mary: RMS "Queen Mary" is a retired ocean liner that sailed primarily on the North Atlantic Ocean from 1936 to 1967 for the Cunard Line (known as Cunard-White Star Line when the vessel entered service).  Built by John Brown & Company in Clydebank, Scotland, "Queen Mary", along with  , were built as part of Cunard's planned two-ship weekly express service between Southampton, Cherbourg and New York.  The two ships were a British response to the express superliners built by German, Italian and French companies in the late 1920s and early 1930s.  "Queen Mary" was the flagship of the Cunard Line from May 1936 until October 1946 when she was replaced in that role by "Queen Elizabeth".

Queensway Twin Bridges: The Queensway Twin Bridges (sometimes Queens Way Bridges or Queensway Bay Bridge) connect downtown Long Beach with the outer Port of Long Beach.  They are the southernmost crossing of the Los Angeles River, near the mouth of the river, where it empties into Queensway Bay, and they are the primary arterial link between Long Beach and RMS "Queen Mary".  The bridges were completed in June 1970 and opened on October 5, 1970.

Port of Long Beach: The Port of Long Beach, also known as the Harbor Department of the City of Long Beach, is the second-busiest container port in the United States, after the Port of Los Angeles, which it adjoins.  Acting as a major gateway for US–Asian trade, the port occupies 3200 acre of land with 25 mi of waterfront in the city of Long Beach, California.  The Port of Long Beach is located less than two miles (3 km) southwest of downtown Long Beach and approximately 25 mi south of downtown Los Angeles.  The seaport generates approximately US$100 billion in trade and employs more than 316,000 people in Southern California.

Port Disney: Port Disney was a planned property of The Walt Disney Company that was to have been built on 443 acre surrounding Queensway Bay next to the Port of Long Beach in Long Beach, California, United States.  The property was to have featured a marine-themed amusement park, a marina, a cruise ship port, a specialty retail and entertainment area, and hotel accommodations.  It was to be built on land occupied by the RMS "Queen Mary" and Hughes H-4 Hercules aircraft (nicknamed the "Spruce Goose"), which Disney acquired as a result of acquiring the Wrather company in 1989.

Aquarium of the Pacific: The Aquarium of the Pacific (formerly the Long Beach Aquarium of the Pacific) is a public aquarium on a 5 acre site on Rainbow Harbor in Long Beach, California, United States.  It is situated across the water from the Long Beach Convention Center, Shoreline Village, and the Queen Mary Hotel and Attraction.

Supporting paragraphs: Port Disney Hughes H-4 Hercules
Answer: birch