Treaty of Eternal Friendship is associated with the conquest of Sindh.

Explanation:
The Treaty of Eternal Friendship was a significant agreement signed between the British East India Company and the ruler of Sindh, Mir Fateh Ali Khan Talpur, on March 6, 1832. This treaty marked the end of the conquest of Sindh by the British.

The conquest of Sindh:
- The conquest of Sindh by the British East India Company took place in the early 19th century. Sindh was ruled by various dynasties, and by the early 1800s, it came under the control of the Talpur rulers.
- The British had been expanding their influence in India and saw Sindh as a strategic location for their trade and military interests.
- In 1830, the British initiated military campaigns against Sindh. The battles of Miani and Hyderabad in 1843 were pivotal in the conquest of Sindh.
- The British forces, led by Sir Charles Napier, defeated the Talpur rulers and established their dominance over Sindh.

The Treaty of Eternal Friendship:
- After the conquest of Sindh, the British East India Company and Mir Fateh Ali Khan Talpur entered into negotiations, resulting in the signing of the Treaty of Eternal Friendship.
- This treaty established friendly relations between the British and the ruler of Sindh.
- The terms of the treaty ensured that the Talpur rulers would retain their sovereignty over Sindh, albeit under the protection and control of the British.
- The treaty also outlined various economic, political, and military arrangements between the two parties.
- It allowed the British to establish a residency in Sindh, which served as a British political agency overseeing the affairs of the region.
- The British also gained control over the external affairs of Sindh, including matters of defense and foreign relations.

In conclusion, the Treaty of Eternal Friendship is associated with the conquest of Sindh by the British East India Company. It marked the end of the military campaign and established a friendly relationship between the British and the Talpur rulers of Sindh.