Final answer:
The provided options for the first state to merge with the Indian Union are incorrect. Historically, the first states to merge were Junagadh, Hyderabad, and Kashmir. The question may refer to smaller regions or princely states, but clarification with accurate historical data is needed.
Step-by-step explanation:
The question addresses the historical integration of states into the Indian Union post-Independence. Although the provided reference information speaks to the Mauryan Empire and the formulation of American Indian policy, these are not directly relevant to the query about Indian state integration. The correct final answer to which was the first state to merge with the Indian Union is not provided amongst the options, as none of the options Bhagat, Bilaspur, Theog, Nurpur reflects the accurate historical record.
Historically, the first states to sign the instrument of accession with India were Junagadh, Hyderabad, and Kashmir. These princely states were more prominent than the regions mentioned in the options and their merger paved the way for the consolidation of the Indian Union.
To provide a more definitive answer, proper historical records and credible sources related to the integration of princely states into India after 1947 would be required, none of which are accurately represented in the given options.