Question: Heidi Newfield and Tim Rushlow, have which nationality?

Context paragraphs:
Burns &amp; Poe: Burns & Poe was an American country music duo composed of Keith Burns and Michelle Poe.  The duo was founded in 2007 after Burns left the group Trick Pony.  Poe was once a solo artist for DreamWorks Nashville, and later played bass guitar for Dierks Bentley and Hank Williams, Jr. The two met in 2007 while Burns was holding auditions to recruit a new lead singer for Trick Pony after Aubrey Collins (who had replaced original lead singer Heidi Newfield just months earlier) left.

Tim Rushlow (album): Tim Rushlow is the solo debut album of American country music artist Tim Rushlow, formerly co-lead vocalist of the country music band Little Texas.  Released in February 2001 on Atlantic Records, it is also his only solo album, although he did release another album and two singles in the band Rushlow, as well as two more singles in the duo Rushlow Harris.  "Tim Rushlow" accounted for four singles on the "Billboard" country singles charts, including "She Misses Him", his only Top 40 country hit.  After Atlantic Records shut down, the album was re-released in 2002 on The Scream Recordings Label and retitled "Crazy Life" after the song of same.  An extra track, "As Real as Forever" was included.

Tim Rushlow: Timothy Ray "Tim" Rushlow (born October 6, 1966) is an American country music artist.  Between 1991 and 1997, Rushlow was lead vocalist of country music group Little Texas, which recorded four albums and a Greatest Hits package, in addition to charting more than fifteen singles on the "Billboard" country singles charts during Rushlow's tenure as lead vocalist.

She Misses Him: "She Misses Him" is a song written by Tim Johnson, and recorded by American country music artist Tim Rushlow.  It was released in October 2000 as the second single from his self-titled album.  The song peaked at number 8 on the U.S. country charts.  It also reached number 59 on the "Billboard" Hot 100.  It was his highest peaking single and his only top 40 single on the country charts.  It was also Rushlow's only peaking single on the Hot 100.

Right Now (Rushlow album): Right Now is the only album released by the American country music band Rushlow, a band fronted by former Little Texas vocalist Tim Rushlow.  "Right Now" produced two singles for the band on the Hot Country Songs charts: "I Can't Be Your Friend" at #16 and "Sweet Summer Rain" at #42.  Additionally, the title track was later recorded by Dean Miller on his 2005 album "Platinum".  "I Can't Be Your Friend" was covered by DHT on their 2005 album "Listen to Your Heart".

Cry Cry ('Til the Sun Shines): "Cry Cry ('Til the Sun Shines)" is a song originally recorded by Martina McBride on her 2007 album "Waking Up Laughing".  It was later recorded by American country music artist Heidi Newfield and released in November 2008 as the second single from the album "What Am I Waiting For".  The song reached #29 on the "Billboard" Hot Country Songs chart.  The song was written by Marv Green, Aimee Mayo, Chris Lindsey and Hillary Lindsey.

Johnny &amp; June (song): "Johnny & June" is the solo debut song co-written and recorded by American country music singer Heidi Newfield, the former lead singer of the group Trick Pony.  It was released in March 2008 as the first single from her debut album "What Am I Waiting For", which was released in August 2008 on Curb Records.  The song reached a peak of #11 on the Hot Country Songs charts in late September 2008.

Pour Me (Trick Pony song): "Pour Me" is a debut song recorded by American country music group Trick Pony.  It was released in October 2000 as the first single from their debut album "Trick Pony".  The song was written by group members Keith Burns, Ira Dean and Heidi Newfield with Rory Waters Beighley and Sammy Harp Wedlock.

Heidi Newfield: Heidi Newfield (born October 4, 1970) is an American country music artist.  She was lead singer, rhythm guitarist and harmonica player for the group Trick Pony, alongside Keith Burns and Ira Dean from 1996 until 2006, when she left in pursuit of a solo career.  Newfield has begun her solo career on Curb Records, debuting in 2008 with the single, "Johnny & June."  This song, which peaked at No. 11 on the Hot Country Songs charts, is the first release from her solo debut album, "What Am I Waiting For", which has produced a second Top 30 country hit, "Cry Cry ('Til the Sun Shines)."

Rushlow: Rushlow was an American country music band founded in 2003 by Tim Rushlow, who was originally the lead vocalist of the country music band Little Texas until 1997, when he left for a solo career.  In addition to Tim Rushlow, who assumed the role of lead vocalist, the group was composed of his first cousin Doni Harris (banjo, acoustic guitar, vocals), as well as Kurt Allison (acoustic guitar, electric guitar, vocals), Tully Kennedy (bass guitar, vocals), Rich Redmond (drums), and Billy Welch (keyboards).

Supporting paragraphs: Heidi Newfield Tim Rushlow
Answer: American