Why do the jets not like the sharks in west side story?

In "West Side Story," the Jets and Sharks are rival gangs representing different ethnic backgrounds—American-born youths versus Puerto Rican immigrants. Their animosity stems from cultural tensions, socio-economic disparities, and a struggle for territory in the same urban space. This rivalry is intensified by misunderstandings and prejudices, leading to conflict and violence throughout the story. Ultimately, their dislike symbolizes broader themes of racism and the challenges of coexistence in a divided society.