Why did Portuguese India end after the Indian invasion of Goa, Daman, and Diu?

Portuguese India ended in December 1961 because the Republic of India, having achieved independence from British rule in 1947, sought to integrate the remaining Portuguese territories into its union.12

Following India's independence, diplomatic pressure on Portugal to cede its holdings increased, but Portugal refused to negotiate. Tensions escalated throughout the 1950s, particularly after the 1955 satyagrahi (nonviolent resistance) movement led to casualties and the subsequent severance of diplomatic relations between the two nations.132

By late 1961, the Indian government determined that its patience was exhausted. On December 18, 1961, Indian forces launched a military operation to invade and occupy Goa, Daman, and Diu. Active resistance to Indian rule ceased the following day, effectively ending Portuguese India. The territories were subsequently incorporated into India, with Goa eventually attaining statehood in 1987.132