Short answers, pulled from the story.
The swing era officially began in 1935 and ended in 1946. Benny Goodman's 1935 engagement at the Palomar Ballroom on the 21st of August 1935 marked the beginning of the swing era, and the period concluded in 1946 due to wartime conditions and economic factors.
Louis Armstrong and Fletcher Henderson developed swing music through rhythmic innovations and ensemble arrangements. Earl Hines worked with Armstrong in 1927 to create a horn-like conception of piano playing, while Don Redman introduced innovative arrangements for the Fletcher Henderson Orchestra.
The swing era started in the United States with key venues including the Palomar Ballroom and the Savoy Ballroom in New York. The Fletcher Henderson Orchestra had an extended residency at the Roseland Ballroom, and the Savoy Ballroom became a touchstone for national success with the Count Basie Orchestra.
The swing era declined due to wartime conditions, economic factors, and government policies. The American Federation of Musicians called a ban on recording in July 1942, and the federal government levied a 30% excise tax on dancing nightclubs in 1944, which undercut the market for dance music.
Swing music transformed American dance culture by creating a national phenomenon where the Lindy Hop and jitterbugging swept across the country. The swing era broke down racial barriers in dance halls and created a shared cultural experience for young Americans during the Great Depression and World War II.