India's vulnerability to cross-border terrorism is rooted in its diverse cultural landscape and historical colonial legacy, which have fostered internal divisions among various ethnic and religious groups. External forces, particularly Pakistan and China, exploit these internal tensions to destabilize the country by supporting militant groups and instigating conflicts, notably in Jammu and Kashmir and the northeastern states. Additionally, India's porous borders and socio-economic challenges contribute to the ease of infiltration and the rise of insurgent movements, exacerbating security threats.