Question: In what country did the style of indie rock, which the group Dartz! played, emerge?

Context paragraphs:
Alternative country: Alternative country (sometimes alt-country, insurgent country, or Americana) is a loosely defined subgenre of country music, which includes acts that differ significantly in style from mainstream country music and pop country music.  Alternative country artists are often influenced by alternative rock.  However, the term has been used to describe country music bands and artists that have incorporated influences ranging from alternative rock, indie rock, roots rock, bluegrass, neotraditional country, punk rock, rockabilly, punkabilly, honky-tonk, outlaw country, progressive rock or progressive country, folk rock, indie folk, folk revival, hard rock, R&B, country rock, heartland rock, Southern metal, Southern rock, experimental music, electronica or folktronica, and psychedelic rock.

Math rock: Math rock is a style of indie rock that emerged in the late 1980s in the United States, influenced by post-hardcore, progressive rock bands such as King Crimson and 20th century minimal music composers such as Steve Reich.  Math rock is characterized by complex, atypical rhythmic structures (including irregular stopping and starting), counterpoint, odd time signatures, angular melodies, and extended, often dissonant, chords.  It bears similarities to post-rock.

Loop rock: Loop Rock is a style of indie rock and math rock that often employs guitar based composition and a wide variety of pedals, including loop pedals.  The genre stems mostly from the rhythmically-complex guitar compositions of math rock and the sound of many indie rock bands.  The genre was made famous and brought to the scene by Comedian Reggie Watts and Indiana-born, Los Angeles based musician Mylets.

Motive for Movement: Motive for Movement was a Tulsa, Oklahoma indie rock band that formed in 2005.  The band consisted of the 4 members now known as Foreign Home.  The band has gone through many style shifts since 2005 but consistently combines angular guitar and syncopated drums for a style often described as ambient shoegazing indie rock with Britpop melodic sensibilities.

Shoegazing Kids: Shoegazing Kids is the second studio album by French indie rock band Stuck in the Sound.  Released on 26 January 2009 through Discograph Records, the album was available as both a physical release and download in their home country of France, but exclusively as a download in a number of other countries.  The songs on the album were all recorded in the same studio and the record was mixed in New York City by producer Nick Sansano and mastered by Ted Jensen.  The record contains a mixture of indie rock and shoegaze genres, and the track "Ouais" was in particular hailed for its Britpop style.  The album featured the first instrumental track to be released by the band and has been described as more ambitious and experimental than Stuck in the Sound's previous effort, "Nevermind the Living Dead".

Indie pop: Indie pop (also typeset as indie-pop or indiepop) is a music genre and subculture that combines guitar pop with DIY ethic in opposition to the style and tone of mainstream pop music.  It originated from British post-punk in the late 1970s and subsequently generated a thriving fanzine, label, and club and gig circuit.  The style, a counterpart of indie rock, differs to the extent that it is more melodic, less abrasive, and relatively angst-free than other indie rock.  In later years, the definition of "indie pop" has bifurcated to also mean bands from unrelated DIY scenes/movements with pop leanings.  Subgenres include chamber pop and twee pop.

Caveman (American band): Caveman is an American indie rock band based in Brooklyn, New York.  The band recorded their first studio album in 2011.  Although originally self-released, the album was re-released by Fat Possum Records in 2012.  Caveman performed at SXSW 2013 and Sasquatch Festival 2013.  The band's musical style is a mixture of indie rock and indie pop.  Caveman also performed at the latest Bonnaroo 2014 Arts and Music Festival.

Independent music: Independent music (often shortened to indie music or indie) is music produced independently from major commercial record labels or their subsidiaries, a process that may include an autonomous, do-it-yourself approach to recording and publishing.  The term "indie" is sometimes also used to describe a genre (such as indie rock and indie pop); as a genre term, "indie" may include music that is not independently produced, and most independent music artists do not fall into a single, defined musical style or genre, and usually create music that can be categorized into other genres.

Sebadoh: Sebadoh ( ) is an American indie rock band, currently signed with Joyful Noise Recordings.  Sebadoh were formed in 1988 in Northampton, Massachusetts, by Eric Gaffney and Dinosaur Jr bass player Lou Barlow.  Along with such bands as Pavement and Guided by Voices, Sebadoh helped pioneer lo-fi music, a style of indie rock characterized by low-fidelity recording techniques, often on four-track machines.  The band's early output, such as "The Freed Man" and "Weed Forestin'" (both released 1990), as well as "Sebadoh III" (1991), was typical of this style.  After a 14-year recording hiatus, during which time members pursued other projects while occasionally touring as Sebadoh, the group returned in 2013 with the "Secret EP" and a full-length album titled "Defend Yourself", which were both self-recorded.  Lead singer Lou Barlow says of the band's resurrected sound, "We kept to ourselves during the recording and didn’t have much, if any, outside intervention.  That, to my mind, makes it a true Sebadoh record and aligns the style of "Defend Yourself" with our early releases."

Dartz!: Dartz!  (often stylized as DARTZ!)  were a Math rock group from Middlesbrough in North East England (UK) who formed at the beginning of 2005.  They are signed to Xtra Mile Recordings in the UK and Deep Elm in the US, and released one full-length album, one mini-album, three singles and a split 7" via Xtra Mile - as well as an EP on Sunderland based DIY micro-label Fakedream Records, and a split 10" with Scottish band Stapleton on Gravity DIP.

Supporting paragraphs: Dartz! Math rock
Answer: United States