Question:  Downtown Greensboro Historic District is home to the location of what series of nonviolent protests in 1960

<P0-S0> February One (also referred to as the A&T Four Monument) is the name of the 2002 monument dedicated to Ezell Blair, Jr., Franklin McCain, Joseph McNeil and David Richmond who were collectively known as the Greensboro Four. <P0-S1>  The 15-foot bronze and marble monument is located on the western edge of the campus of North Carolina Agricultural and Technical State University in Greensboro, North Carolina. <P0-S2>  James Barnhill, the sculptor who created the monument, was inspired by the historic 1960 image of the four college aged men leaving the downtown Greensboro Woolworth store after holding a sit-in protest of the company's policy of segregating its lunch counters. <P0-S3>  The sit-in protests were a significant event in the Civil Rights Movement due to increasing national sentiment of the fight for the civil rights of African-Americans during this period in American history. <SEP> <P1-S0> Downtown Greensboro Historic District is a national historic district located at Greensboro, Guilford County, North Carolina. <P1-S1>  The district encompasses 96 contributing buildings in the central business district of Greensboro. <P1-S2>  The Woolworth's store is notable as the site of the Greensboro sit-ins of 1960. <P1-S3>  The commercial buildings were built between about 1885 and the 1930s in a variety of popular architectural styles including Italianate and Art Deco. <P1-S4>  Located in the district is the separately listed Jefferson Standard Building. <P1-S5>  Other notable buildings include the Vanstory Building (c. 1885), Kress Building (1929), Woolworth's (c. 1929), Efrid's Department Store (c. 1930), Montgomery Ward (1936), the Carolina Theatre (1927), Center Theatre (1948), the former Belk Building (1939), Ellis Stone/Thalhimer's Department (1949-1950), and the former American Exchange National Bank Building (1920). <SEP> <P2-S0>  While not the first sit-in of the Civil Rights Movement, the Greensboro sit-ins were an instrumental action, and also the most well-known sit-ins of the Civil Rights Movement. <P2-S1> The Greensboro sit-ins were a series of nonviolent protests in Greensboro, North Carolina, in 1960, which led to the Woolworth department store chain removing its policy of racial segregation in the Southern United States. <P2-S2>  These sit-ins led to increased national sentiment at a crucial period in US history. <P2-S3>  The primary event took place at the Greensboro, North Carolina, Woolworth store, now the International Civil Rights Center and Museum. <SEP> <P3-S0> February One: The Story of the Greensboro Four is a 2003 documentary film by Rebecca Cerese and Steven Channing. <P3-S1>  Nationally broadcast on "Independent Lens" on PBS, it tells the story of The Greensboro Four, four young college freshman, Joseph McNeil, David Richmond, Franklin McCain and Ezell Blair, Jr. now Jibreel Khazan, who staged a sit-in at Woolworth's in 1960 to protest segregation practices. <P3-S2>  Based largely on first hand accounts and rare archival footage, the documentary film "February One" documents one volatile winter in Greensboro that not only challenged public accommodation customs and laws in North Carolina, but served as one of the blueprints for the nonviolent protests that occurred across the South and the nation during the Civil Rights Movement in the 1960s.