The First Indian State to enter into the Subsidiary Alliance with the East India Company was

The first Indian state to enter into the Subsidiary Alliance with the East India Company was the Kingdom of Awadh (also known as Oudh) in 1798.

Here are the steps that led to this:

1. The Subsidiary Alliance was a system that the East India Company used to establish control over Indian states without annexing them. It was introduced by Lord Wellesley, the British Governor-General in India from 1798 to 1805.

2. According to the terms of the alliance, Indian rulers were not allowed to have their independent armed forces. They were to be protected by the Company, but had to pay for the 'subsidiary forces' that the Company was supposed to maintain for the purpose of this protection. If the Indian rulers failed to make the payment, then part of their territory was taken away as penalty.

3. The Kingdom of Awadh, ruled by Nawab Asaf-ud-Daula, was the first to enter into such an alliance. The Nawab was in a weak position and was facing threats from the Marathas. When the British offered protection via the Subsidiary Alliance, he accepted.

4. The alliance proved to be detrimental for the Indian states. It was a method of indirect rule that led to the political and economic domination of India by the British.