**Answer:**

The Danes, who had established settlements in India, sold all their settlements to the British in 1845. This marked the end of Danish colonial presence in India.

**Danish Settlements in India:**

The Danes had established three settlements in India during the colonial era. These settlements were:

1. Tranquebar (Tharangambadi): Tranquebar was the first Danish settlement in India, established in 1620. It was located on the Coromandel Coast of present-day Tamil Nadu.

2. Serampore (Frederiksnagore): Serampore was established in 1755 and was located near Kolkata in present-day West Bengal. It was an important center for Danish trade and missionary activities.

3. Nicobar Islands: The Danes also briefly controlled the Nicobar Islands in the Bay of Bengal. However, due to its remoteness and lack of economic viability, the Danish control over the Nicobar Islands was short-lived.

**Sale of Danish Settlements:**

Over time, the Danish settlements in India faced various challenges, including conflicts with other European powers, financial difficulties, and declining trade. As a result, the Danes decided to sell their settlements to the British.

The sale of Danish settlements took place in 1845, and it involved negotiations between the Danish and British authorities. The British East India Company, which had already established its dominance in India, saw the acquisition of the Danish settlements as an opportunity to further consolidate its control.

**Reasons for Sale:**

There were several reasons behind the Danish decision to sell their settlements in India:

1. Financial Difficulties: The Danish settlements had been facing financial difficulties for some time. The declining trade and increasing expenses made it difficult for the Danes to sustain their presence in India.

2. Decline in Trade: The Danish settlements had lost their significance as centers of trade. The competition from other European powers, including the British, Dutch, and French, had reduced their trade opportunities.

3. Strategic Considerations: The Danish settlements were vulnerable to attacks from other European powers. Selling the settlements to the British ensured their protection and security under British rule.

4. Lack of Support: The Danish government was not able to provide sufficient support to the settlements due to its own limitations and priorities. This further contributed to the decision to sell the settlements.

**Conclusion:**

In conclusion, the Danes sold all their settlements in India to the British in 1845. This was due to financial difficulties, declining trade, strategic considerations, and lack of support from the Danish government. The sale marked the end of Danish colonial presence in India and further strengthened British control in the region.