Why was it complex to include both princely states and British Indian provinces in the federal scheme discussed at the Round Table Conferences?

Correct answer: Their political status and systems of government were different

British Indian provinces were governed under British authority, while princely states were ruled by princes under different arrangements with the British. A federation therefore required agreement on how the states would join and how they would be represented and governed. The proposed federation in the Government of India Act 1935 did not come into operation because the required princely-state accession did not occur.