The flowering of African American creativity in New York City during the 1920s is known as the

The Niagara Movement was an early civil rights organization founded in 1905 that sought to oppose racial segregation and discrimination. While it played a significant role in advocating for African American rights, it is not synonymous with the cultural and artistic explosion that characterized the Harlem Renaissance.

The Pan-African Congress refers to a series of meetings aimed at addressing issues affecting people of African descent globally. Although it contributed to the discourse on race and identity, it is not specifically tied to the artistic and cultural developments in New York City during the 1920s.

The New York League of Arts was not a prominent movement or organization recognized in the context of African American cultural development during the 1920s. It does not encapsulate the significant literary and artistic achievements that define the Harlem Renaissance.

The Black Arts Movement emerged in the 1960s and 1970s, focusing on the cultural and political expression of African Americans through literature, visual arts, and performance. While it is an important movement in African American history, it occurred after the Harlem Renaissance.