Evergreen Marine Corporation () ( ), is a Taiwanese container transportation and shipping company.
 Headquartered in Luzhu District, Taoyuan City, Taiwan, Evergreen Marine is a global containerized-freight shipping company.
 Its principal trading routes are: the Far East to North America, Central America and the Caribbean; the Far east to northern Europe and the east Mediterranean; Europe to the east coast of North America; the Far East to Australia, Mauritius, South Africa and South America; and an intra Asia service linking ports in Asia to the Middle East, Persian Gulf and the Red Sea.
 With over 150 container ships it is part of the Evergreen Group conglomerate of transportation firms and associated companies.
 Evergreen calls on 240 ports worldwide in about 80 countries, and is the fourth largest company of its type, ranked behind Maersk, Mediterranean Shipping Company, and CMA CGM (in order).
 The company's activities include: shipping, construction of containers and ships, management of ports, and engineering and real estate development.
 Subsidiaries and divisions include Uniglory Marine Corp. (Taiwan), Evergreen UK Ltd. (UK), and shipping company Italia Marittima S.p.A. (Italy).
 In 2007, Hatsu, Italia Maritima, and Evergreen were merged into the single "Evergreen Line."
USS "Advance, the second United States Navy ship to be so named, was later known as the USS "Frolic, and was originally the blockade runner CSS "Advance" captured by the Union Navy during the latter part of the American Civil War.
 She was purchased by the Union Navy and outfitted as a gunboat and assigned to the blockade of the waterways of the Confederate States of America.
 She also served as dispatch ship and supply vessel when military action eventually slowed down.
The Action of 1 March 1968 refers to a co-ordinated attempt by four North Vietnamese trawlers to resupply the Viet Cong and the efforts of Operation Market Time elements to stop them during the Vietnam War.
 On 28 February 1968, United States Navy SP-2H Neptune aircraft on routine patrol detected a North Vietnamese SL class naval trawler heading towards the South Vietnamese coast from north of the DMZ.
 By the next morning, three more trawlers were discovered and units of Operation Market Time were deployed for a surprise interception.
 The suspect trawlers did not fly flags so it was not until the start of the engagement that their origin was discovered.
 The trawlers were steel hulled vessels, 100 feet long and armed with 57-millimeter recoilless rifles and machine guns. All four vessels were loaded with weapons and ammunition intended to be delivered to the Viet Cong.
 American and South Vietnamese forces that engaged in action included the United States Coast Guard cutters "Androscoggin" , "Point Grey" , "Point Welcome" , "Winona" , "Point Grace" , "Point Hudson" , "Point Marone" , the swift boats USS "PCF-18" , USS "PCF-20" , USS "PCF-42" , USS "PCF-43" , USS "PCF-46" , USS "PCF-47" and USS "PCF-48" , two South Vietnamese navy junks and one patrol boat.
 Two U.S. Army helicopter gunships also participated in combat as well as aircraft used to fire flares.
The very first USS "Hatteras" was a 1,126-ton steamer purchased by the Union Navy at the beginning of the American Civil War.
 She was outfitted as a gunboat and assigned to the Union blockade of the ports and waterways of the Confederate States of America.
 During an engagement with the disguised Confederate commerce raider, CSS "Alabama", she was taken by surprise and was sunk off the coast of Galveston, Texas.
 The wreck site is one of the few listed on the National Register of Historic Places because of its location away from destructive surf and because of the ship's side-wheel design, which marks the transition between wooden sailing ships and steam-powered ships.
In computing, MOESI is a full cache coherency protocol that encompasses all of the possible states commonly used in other protocols.
 In addition to the four common MESI protocol states, there is a fifth "Owned" state representing data that is both modified and shared.
 This avoids the need to write modified data back to main memory before sharing it.
 While the data must still be written back eventually, the write-back may be deferred.
USS "Cactus" (1863) was a steamer acquired by the Union Navy during the American Civil War for service with the Union blockade of the ports and waterways of the Confederate States of America.
The Confederate States of America (CSA or C.S.), commonly referred to as the Confederacy, was an unrecognized country in North America that existed from 1861 to 1865.
 The Confederacy was originally formed by seven secessionist slave-holding states – South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas – in the Lower South region of the United States whose regional economy was mostly dependent upon agriculture, particularly cotton, and a plantation system that relied upon the labor of African-American slaves.
Gilbert Favre (November 19, 1936 – December 12, 1998) was a clarinetist from Geneva, Switzerland.
 He trained at the Conservatory of Geneva, and also played jazz clarinet.
 In South America, he discovered the quena, and when he moved to Bolivia, he traded in his clarinet.
 In La Paz, he created the musical cabaret La Pena de Naira at the Place San Francisco featuring indigenous music.
 The club became a hub for the diplomatic corps stationed in La Paz, as well as a favorite for Bolivians.
 Gilbert was the founding member of the popular Bolivian folk group Los Jairas.
 Favre was commonly referred to as "El Gringo" by the Bolivian public.
 Favre traveled from Geneva to South America as assistant to the Swiss anthropologist Jean Christian Spahni.
 In Santiago, Favre met celebrated Chilean folk singer Violeta Parra and fell in love.
 Favre played quena with Violeta and her son Angel Parra.
 He appears on recordings as "El Tocador Afuerino".
 Favre eventually left for Bolivia, where he created La Pena de Naira and started experimenting with Andean music playing alongside virtuoso guitar player Alfredo Dominguez and renowned singer Ernesto Cavour.
 Parra appeared several times at La Pena.
 Favre returned to Geneva in the early 1960s together with Parra; after a few years in Europe, they returned to South America.
Alternanthera philoxeroides, commonly referred to as alligator weed, is a native species to the temperate regions of South America, which includes Argentina, Brazil, Paraguay and Uruguay.
 Argentina alone, hosts around 27 species that fall within the range of the genus Alternanthera.
 Its geographic range once used to cover only the Parana River region of South America, but it has since expanded to cover over 30 countries, such as the United States, New Zealand, China and many more.
 This invasive species is believed to have been accidentally introduced to these non-native regions through sediments trapped/attached to tanks and cargo of ships travelling from South America to these various areas.
USS "South America" (1861) was a whaler purchased by the Union Navy on 9 November 1861 at New London, Connecticut.
 She was acquired to be sunk as an obstruction in the channel leading to a Confederate port as part of the Union blockade on ports and waterways of the Confederate States of America.

Question: USS South America was used to block ports and waterways on states commonly referred to as what?
Answer: the Confederacy