The annexation of Punjab was a result of several events that occurred during the British rule in India. The following are the key events that led to the annexation of Punjab:

1. Anglo-Sikh Wars: The British and the Sikhs fought two wars - the First Anglo-Sikh War in 1845 and the Second Anglo-Sikh War in 1848-49. The British emerged victorious, and the Treaty of Lahore was signed in 1846, which ceded the territories of Jammu and Kashmir, Ladakh, and Hazara to the British. However, the Sikhs did not accept the treaty, and the British annexed Punjab in 1849.

2. The British East India Company: The British East India Company was expanding its territories in India, and Punjab was one of the few areas that remained independent. The Company was keen on annexing Punjab as it would give them access to the lucrative trade routes to Central Asia.

3. Revolt of 1857: The Revolt of 1857 was a turning point in Indian history. The British feared that Punjab might also join the rebellion, and hence they decided to annex Punjab to prevent any such uprisings.

4. The Doctrine of Lapse: The Doctrine of Lapse was a policy introduced by Lord Dalhousie, which stated that any Indian ruler who did not have a natural heir would have his kingdom annexed by the British. This policy was applied to several small princely states in Punjab, which were annexed by the British.

5. The British Raj: The British Raj was established in India in 1858, after the Revolt of 1857. Punjab was one of the last territories to be annexed by the British, and it was done to consolidate their hold over India.

In conclusion, the annexation of Punjab was a result of several events, including the Anglo-Sikh Wars, the expansion of the British East India Company, the Revolt of 1857, the Doctrine of Lapse, and the establishment of the British Raj. These events led to the annexation of Punjab, which became an integral part of British India.

Annexation of Punjab:

..By 1843, the British had taken over Afghanistan and Sind because they feared Russia's expansion.

..Ranjit Singh's presence stopped the East India Company from taking over Punjab.

..After his death in 1839, the British fought two long wars with the Sikh kingdom. ( Anglo- Sikh Wars)

..Punjab was finally annexed in 1949.