Mexico is especially associated with the quinceañera tradition’s name and widespread modern practice.
Mexico has played a major role in shaping and popularizing the contemporary quinceañera, although the celebration is practiced throughout Latin America and among Latino communities worldwide. Mexican celebrations commonly combine a formal dress, family reception, music, a court, symbolic rituals, and sometimes a Catholic Mass.
This answer does not mean that quinceañeras belong exclusively to Mexico. The tradition is important in countries including the Dominican Republic, Puerto Rico, Colombia, Venezuela, and many others. Each location has its own vocabulary, music, food, religious customs, and preferred ceremonial sequence.
The name itself comes from Spanish, and Mexico’s large population and cultural influence have helped make the Mexican form especially familiar internationally. A family’s celebration may therefore look Mexican, Caribbean, Central American, South American, or distinctly local. The shared milestone is more consistent than any single worldwide script.