Question: The Hot Shots is a collective name for two closely related Swedish dance companies who perform a dance developed from the "prize walks" held in the latter part of what century?
Context: Bofors 75 mm and Bofors 80 mm were two closely related designs of anti-aircraft and general-purpose artillery.  Less well known than the 40 mm quick-firing AA gun, the gun was nevertheless adopted by armed forces of numerous countries during World War II, including Argentina, China, Dutch East Indies, Finland, Greece, Hungary, Persia and Thailand.  It was closely related to the 8.8 cm Flak 18/36/37/41, one of the best-known AA guns of World War II, which was partially based on it.  Some pieces captured by the Japanese in China served as the blueprint for the Type 4 75 mm AA Gun, a reverse-engineered clone of the Bofors 75mm gun. Eriosorus and Jamesonia are two closely related genera in the taenitoid group of the core pteridoid ferns.  They have long been recognized as being closely related, and recent genetic evidence has demonstrated that they are both paraphyletic genera, but only in regards to each other.  Thus, they must be combined as a single larger genus, or have the generic boundaries redefined.  The two genera are being temporarily considered here under "Jamesonia", because 1) this is the older genus name, and 2) the core genus forms a clearly defined monophyletic group considered by itself, while there is no such clear clade for "Eriosorus". Tradescantia longipes, commonly known as the wild crocus (although it is not closely related to plants in the genus "Crocus"), is a perennial herbaceous plant in the dayflower family.  It is found only in the Ozark Mountains of southern Missouri and northern Arkansas in the Midwest United States.  A spring blooming species, its flowers can be observed from April to May, typically in its preferred habitat of wooded slopes on rocky hillsides.  While most other members of the genus in North America have stems reaching at least a few inches above the soil, the flowering shoots of "Tradescantia longipes" are borne essentially at ground level.  This character is shared with some individuals of "Tradescantia hirsuticaulis" and "Tradescantia virginiana", two closely related species, although both typically have obvious stems.  Regardless, "Tradescantia longipes" can be distinguished from the former with its longer pedicels and bracts without fine hairs, and from the latter by the presence of at least some glandular hairs on the sepals.  Furthermore, "Tradescantia longipes" is a tetraploid, meaning it has four sets of chromosomes, while "Tradescantia hirsuticaulis" is diploid with only two sets.  "Tradescantia virginiana" occurs in both diploid and tetraploid forms, although it is consistently tetraploid where its range overlaps with "Trandescantia longipes". The Sorbian languages (Upper Sorbian: "Serbsce"; Lower Sorbian: "Serbski") are two closely related languages spoken by the Sorbs, a West Slavic minority in the Lusatia region of eastern Germany.  They are classified under the West Slavic branch of the Indo-European languages and are therefore closely related to the other two West Slavic subgroups: Lechitic and Czech–Slovak.  Historically the languages have also been known as Wendish (named after the Wends, earliest Slavic people in modern Poland and Germany) or Lusatian.  Their collective ISO 639-2 code is wen. A Coldblood Trotter may belong to either one of two closely related and interconnected breeds of horse: the Norsk Kaldblodstraver (Norwegian Coldblood Trotter) and the Svensk Kallblodstravare (Swedish Coldblood Trotter).  Coldblood trotters, also known widely in international breed registries as "Draft Trotters", are the result of crossbreeding lighter and faster horses with native coldblooded farm horses, either the Norwegian Dølehest or the North Swedish Horse.  Although the Norwegian and Swedish coldblood trotters are substantially considered a single breed, two national studbooks are maintained, and registration requirements differ in some respects between the two countries. The Hot Shots is a collective name for two closely related Swedish dance companies based in Stockholm, Sweden: The Rhythm Hot Shots and the Harlem Hot Shots.  The Hot Shots specialize in faithful reproductions of African-American dance scenes in American films from the 1920s, 30s, and 40s.  Dances that they perform include Lindy Hop, Tap dance, Cakewalk, Charleston, and Black Bottom.  The members of the Hot Shots are also respected dance instructors and accomplished social dancers.  The goals of The Rhythm Hot Shots and the Harlem Hot Shots are the same. Hot Shots!  is a 1991 comedy film which stars Charlie Sheen, Cary Elwes, Valeria Golino, Lloyd Bridges, Jon Cryer, Kevin Dunn, Kristy Swanson, and Bill Irwin.  It was directed by Jim Abrahams, co-director of "Airplane! ", and was written by Abrahams and Pat Proft.  It was followed by a sequel, "Hot Shots!  Part Deux" in 1993.  Both Sheen and Cryer would later costar in the TV series "Two and a Half Men", with Ryan Stiles playing a recurring role.  The film is primarily a parody of "Top Gun", with some scenes spoofing other popular films, including "9½ Weeks", "Dances with Wolves", "Marathon Man", "Rocky", "Superman" and "Gone with the Wind". The cakewalk or cake walk was a dance developed from the "prize walks" held in the late 19th century, generally at get-togethers on black slave plantations in the Southern United States.  Alternative names for the original form of the dance were "chalkline-walk", and the "walk-around".  At the conclusion of a performance of the original form of the dance in an exhibit at the 1876 Centennial Exposition in Philadelphia, an enormous cake was awarded to the winning couple.  Thereafter it was performed in minstrel shows, exclusively by men until the 1890s.  The inclusion of women in the cast "made possible all sorts of improvisations in the Walk, and the original was soon changed into a grotesque dance" which became very popular across the country. African-American dance has developed within Black American communities in everyday spaces, rather than in studios, schools or companies.  These dances are usually centered on folk and social dance practice, though performance dance often supplies complementary aspects to this.  Placing great value on improvisation, these dances are characterized by ongoing change and development.  There are a number of notable African-American modern dance companies using African-American cultural dance as an inspiration, amongst these are the Whitey's Lindy Hoppers, Alvin Ailey American Dance Theater, Dance Theatre of Harlem, and Lula Washington Dance Theatre.  Unlike European-American dance, African-American dance was not taxed in the fields of Europe where it began and has not been presented in theatrical productions by generations of kings, tzars, and states.  Instead, it lost its best dancers to the draft and started requiring taxes from establishments in the form of a federal excise tax on dance halls enacted in 1944.  Dance halls continue to be taxed throughout the country while dance studios are not, and African-American dance companies statistically receive less than taxpayer money than European-Americans.  However, Hollywood and Broadway have provided wonderful opportunities for African-American artists to share their work and for the public to support them.  Michael Jackson and Beyonce are the most well-known African-American dancers. The Katla languages are two closely related languages that form a small language family in the Nuba Hills of Sudan.  Part of an erstwhile Kordofanian proposal, they are of uncertain position within the Niger–Congo family.  They do not share the characteristic morphology of Niger–Congo, such as the noun-class system.  Thus Roger Blench classifies them as a divergent branch of Niger–Congo outside the Atlantic–Congo core.  A similar situation holds for another Kordofanian family, Rashad; these are not closely related to Katla.
Answer: 19th