ROH/NJPW War of the Worlds (2017)  War of the Worlds (2017) was a professional wrestling tour co-produced by the American Ring of Honor (ROH) and Japanese New Japan Pro-Wrestling (NJPW) promotions. The tour's four events took place on May 7 at the Ted Reeve Arena in Toronto, Ontario, May 10 at the Ford Community & Performing Arts Center in Dearborn, Michigan, May 12 at the Hammerstein Ballroom in New York City and May 14 at the 2300 Arena in Philadelphia, Pennsylvania. The third night aired live on pay-per-view (PPV), while the fourth night was taped for four future episodes, including the 300th overall episode, of ROH's weekly television program, "Ring of Honor Wrestling". 2017 was the fourth year in which ROH and NJPW co-produced events under the War of the Worlds name. During the third night of the tour, NJPW announced the creation of the IWGP United States Heavyweight Championship. In 2014, Japanese promotion New Japan Pro-Wrestling (NJPW) and Ring of Honor (ROH) formally forged a relationship, which saw them present the first War of the Worlds show on May 17, 2014, at the Hammerstein Ballroom in New York City, New York. The following year, War of the Worlds was held over two days at the 2300 Arena in Philadelphia, Pennsylvania and in 2016 it was expanded to a three-show tour with shows taking place in Dearborn, Michigan, Toronto, Ontario and New York City. The 2017 War of the Worlds tour was officially announced in January 2017, when ROH put tickets on sale for the events. At that point, ROH announced a three-show tour with events taking place on May 7 in Toronto, May 10 in Dearborn and May 14 in Philadelphia with rumors of a fourth show to be added later. The fourth show, taking place on May 12 in New York City, was officially added to the tour in March. It was also announced that the show would air on pay-per-view (PPV) as well as the FITE TV application, PlayStation Network and ROHWrestling.com. In Japan, the show would also air live on NJPW's internet streaming site, NJPW World. These would mark the fourth annual shows co-promoted by NJPW and ROH. ROH began announcing the NJPW wrestlers for the tour on April 17, starting with IWGP Intercontinental Champion Tetsuya Naito and Kushida.