Question: KO Magazine and Pro Wrestling Illustrated, are located in which country?

Context paragraphs:
Pro Wrestling Illustrated: Pro Wrestling Illustrated ("PWI") is an American produced, internationally sold professional wrestling magazine that was founded in 1972.  "PWI" is headquartered in Blue Bell, Pennsylvania and published by Kappa Publishing Group.  The magazine is the longest currently published English language wrestling magazine.  The "PWI" publishes monthly issues and annual special issues such as their "Almanac and Book of Facts".

Cheerleader Melissa: Melissa Anderson (born August 17, 1982) is an American professional wrestler, better known by her ring name Cheerleader Melissa.  She is best known for her work in Total Nonstop Action Wrestling, where she worked as Alissa Flash and Raisha Saeed.  She is currently performing on the independent circuit for promotions such as Pro Wrestling Revolution and Shimmer Women Athletes, where she is a former two-time Shimmer Champion.  In 2013, Anderson was ranked #1 in "Pro Wrestling Illustrated"'s annual Top 50 Females list.

Break the Barrier: Break The Barrier was a professional wrestling supercard held at Viking Hall, better known as the ECW Arena, in Philadelphia, Pennsylvania on May 15, 1999.  The event was organized by the founders of Scoopswrestling.com, Al Isaacs, Remy Arteaga and Barbi Bistrowitz, and brought together some of the top independent wrestlers from around the country.  It was one of the biggest interpromotional events in the United States and represented by 12 independent promotions including Allied Powers Wrestling Federation, Combat Zone Wrestling, Extreme Championship Wrestling, Independent Pro Wrestling, Independent Professional Wrestling Alliance, Maryland Championship Wrestling, Music City Wrestling, NWA New Jersey, New Dimension Wrestling, South's Greatest Wrestling Fans, Steel City Wrestling, World Legion Wrestling and World Wrestling Organization.  Pro Wrestling Illustrated has called it "one of the greatest Supercards of all time".

Amy Vitale: Amy M. Vitale (born June 12, 1977) is an American model, actress, and professional wrestling valet, best known under her nickname "The Italian Princess of Wrestling".  She works for such promotions as the Sunshine Wrestling Federation, Future of Wrestling, Full Impact Pro, Florida Championship Wrestling, the Independent Professional Wrestling Association and NWA New York.  She has managed a number of professional wrestlers on the Florida independent circuit including Francisco Ciatso, Jerry Lynn, New Jack, Alex Porteau and The Heartbreak Express.  Vitale has been profiled in "Pro Wrestling Illustrated" and "Wrestling World Magazine" on several occasions, as well as "Fighting Females Magazine"; she has been voted as "Florida Woman of the Year" three years in a row, and "Pro Wrestling Manager of the Year" two years in a row.

KO Magazine: KO Magazine was a popular United States boxing magazine.  It was first published in 1980, to compete with "The Ring".

Sara Del Rey: Sara Amato (born November 13, 1980) is an American professional wrestling trainer and retired professional wrestler best known by her ring name Sara Del Rey.  She was a mainstay for Chikara and Shimmer, but also appeared for many other independent promotions in the United States, including Ring of Honor (ROH), IWA Mid-South and All Pro Wrestling, as well as Mexico's Lucha Libre Femenil.  Del Rey also taped several matches, competing under a mask and using the name Nic Grimes, for the MTV promotion Wrestling Society X.  Del Rey was the inaugural Shimmer Champion and co-holder of the Shimmer Tag Team Championship with Courtney Rush, making her the promotion's first double champion.  In 2012, Del Rey became only the fourth woman to make it to Pro Wrestling Illustrated's list of top 500 wrestlers in the world.  She is currently employed by World Wrestling Entertainment (WWE) as the Assistant Head Coach and producer of their developmental territory NXT, based at the WWE Performance Center.

Bambi Hall: Samantha Hall (born July 14, 1992) better known by her ring name Bambi Hall is a Canadian female professional wrestler who debuted on June 18, 2011, and for All Star Wrestling (ASW), in June 2012 currently working for All Star Wrestling, and is the current Women's Champion.  Hall also works for other Canadian independent promotions including Canadian National Wrestling Alliance (CNWA), Big West Wrestling (BWW), Beauty Slammers Wrestling (BSW), Canadian Wrestling's Elite (CWE), Wise Pro Wrestling (WPW), Elite Canadian Championship Wrestling (ECCW), Real Canadian Wrestling (RCW), Vancouver Island Pro Wrestling (VIPW), Pure Wrestling Association (PWA), Monster Pro Wrestling (MPW), Trash Wrestling, Pure Power Wrestling (PPW), Tony Condello Promotions (TCP), Gold Dragon Wrestling (GDW), and Midget Wrestling Warrirors (MWW), as well Hall has also competed in the United States in SHIMMER Women Athletes, West Coast Wrestling Connection (WCWC), and Vendetta Pro Wrestling (VPW), in Las Vegas, Nevada.

Naohiro Hoshikawa: Naohiro Hoshikawa (星川直宏 , Hoshikawa Naohiro , born December 13, 1974) is a retired Japanese professional wrestler.  Hoshikawa competed extensively in Michinoku Pro Wrestling, Osaka Pro Wrestling and Pro Wrestling Zero1 until he was forced to retire after suffering a career-ending brain injury in 2004.  Hoshikawa also competed in All Japan Pro Wrestling, Big Japan Pro Wrestling, Pro Wrestling Noah and Battlarts.

List of professional wrestling magazines: This is a list of professional wrestling magazines.  They are published either in print or online and range from official magazines of professional wrestling promotions to "dirt sheets", which cover more insider information and sometimes rumors.  Some of the more notable magazines include "Pro Wrestling Illustrated", "Fighting Spirit Magazine", "Wrestling Observer Newsletter", "Power Slam", "WWE Magazine", "Pro Wrestling Torch", and "The Bagpipe Report".

Virtual Pro Wrestling 64: Virtual Pro Wrestling 64 is a professional wrestling video game released in 1997 on the Nintendo 64 game console and the second game in the "Virtual Pro Wrestling" series.  The game was only released in Japan and uses a slightly remodeled version of "'s" engine.  The game features wrestlers from WCW, but also includes generic renditions of wrestlers from major Japanese promotions such as New Japan Pro Wrestling and All Japan Pro Wrestling, a feature that would continue following the release of the sequel "Virtual Pro Wrestling 2".  The game is a semi-sequel to "Virtual Pro-Wrestling" released that same year exclusively for the PlayStation.  "VPW 64" was succeeded by Virtual Pro Wrestling 2: Ōdō Keishō, which was released on the Nintendo 64 in 2000.

Supporting paragraphs: KO Magazine Pro Wrestling Illustrated
Answer: United States