The annexation of Berar by Lord Dalhousie took place in the year 1853.

Explanation:
Berar, a region in central India, was under the rule of the Nizam of Hyderabad. Lord Dalhousie, who served as the Governor-General of India from 1848 to 1856, was known for his policy of annexation and consolidation of territories under British control. He aimed to bring various princely states and regions under British administration.

Here is a detailed explanation of the annexation of Berar:

1. Background:
Berar was a region that had been historically ruled by different dynasties, including the Deccan Sultanates and the Marathas. In the early 19th century, it came under the control of the Nizam of Hyderabad. The Nizam was a semi-autonomous ruler who acknowledged British suzerainty.

2. Lord Dalhousie's Annexation Policy:
Lord Dalhousie believed in the Doctrine of Lapse, which stated that if a ruler of a princely state did not have a legitimate male heir, the state would be annexed by the British East India Company. He used this policy as a justification for annexing several princely states during his tenure.

3. Annexation of Berar:
In 1853, Lord Dalhousie annexed Berar, citing the Doctrine of Lapse. The Nizam of Hyderabad, who ruled over Berar, did not have a legitimate male heir. Therefore, Dalhousie considered it as an opportunity to expand British control and brought Berar under direct British administration.

4. Impact:
The annexation of Berar by Lord Dalhousie further increased British influence in central India. It consolidated British control over the region and weakened the authority of the Nizam of Hyderabad. The British East India Company gained administrative and economic control over Berar.

In conclusion, the annexation of Berar by Lord Dalhousie took place in 1853. This event was a part of Dalhousie's policy of annexation and consolidation of territories under British control in India. The annexation of Berar further expanded British influence in central India and weakened the authority of the Nizam of Hyderabad.