Explanation: Sikkim, a small Himalayan state located in the northeastern part of India, has a unique history that culminated in its integration into the Indian Union as the 22nd state. Prior to 1975, Sikkim was a protectorate of India, with a monarchy that had been in place since the 17th century. The protectorate status meant that Sikkim was under the protection of India but retained a degree of autonomy.
The transition to statehood began with a referendum held in 1975, where the people of Sikkim voted overwhelmingly in favor of joining the Indian Union. This referendum was a significant step as it reflected the will of the people and paved the way for legislative actions that would formalize Sikkim's integration into India. Following the referendum, the Indian Parliament passed the 36th Amendment to the Constitution of India, which officially made Sikkim a part of India on May 16, 1975.
The process of becoming a state involved several key steps:
1. **Referendum**: A referendum was held to gauge the public opinion on joining India. The result was a clear majority in favor of statehood.
2. **Legislative Actions**: The Indian Parliament passed the 36th Amendment to the Constitution, which incorporated Sikkim into the Indian Union.
3. **Abolition of Monarchy**: The monarchy, which had been a significant part of Sikkim's governance, was abolished, and a democratic system was established.
Understanding the historical context is crucial to comprehending why 1975 is the correct year for Sikkim's statehood. The year 1975 marks a significant transition in Sikkim's political status, from a protectorate to a full-fledged state of India, reflecting the democratic will of its people and the formal legislative actions taken by the Indian government.
It is important to note that the other years mentioned in the options (1972, 1978, and 1980) are not associated with Sikkim's statehood. These years might be confused with other significant events in Sikkim's history or in the broader context of Indian history, but they do not mark the year when Sikkim became a part of India as its 22nd state.
In summary, the year 1975 is the correct answer because it represents the culmination of a process that included a referendum and legislative actions, leading to Sikkim's integration into the Indian Union as a state. This event is a pivotal moment in Sikkim's history and is a key piece of information for understanding the political geography of India.