What were the first sets established by the United Blood Nation?

The United Blood Nation, a predominantly African American gang that originated in the New York City prison system in the 1990s, was formed as a response to the dominance of rival gangs, particularly the Latin Kings and the Aryan Brotherhood. The first sets established by the United Blood Nation were indeed the 9-Trey Gangsters and 18-Trey Gangsters.

These specific sets became foundational to the United Blood Nation's structure, where the numbers signify different factions within the gang. Each set has its own leadership and local operations but operates under the broader umbrella of the United Blood Nation. This organization emphasizes loyalty to the Blood identity and provides solidarity against rival gangs. The distinction between these sets is crucial as it reflects the organized and hierarchical nature of gang structures that often draw upon numerical symbolism to define allegiance and territory within the gang culture.

In contrast, the other options present names of different gangs or sets that belong to separate organizations or were formed later, making them incorrect in the context of the first sets established by the United Blood Nation.