The events occurred in the following chronological order: - The Formation of Bangladesh took place on December 16, 1971. - Sikkim became the 22nd state of the Indian Union on May 16, 1975. - The SLV-3 (Satellite Launch Vehicle) was launched on July 18, 1980. - The first nuclear test by India (Pokharan-I) was conducted on May 18, 1974. Therefore, the correct order is II, III, I, IV.
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