Main Ports that Joined the Routes in the 18th Century:

- Surat
- Masulipatnam
- Madras
- Calcutta

Explanation:

During the 18th century, the European trading companies established their presence in India, leading to the emergence of new trade routes and ports. These ports were strategically located along the coast of India, facilitating the exchange of goods and ideas between India and the rest of the world. The main ports which joined the routes in the 18th century were Surat, Masulipatnam, Madras, and Calcutta.

Surat: Surat was an important port city and a center of trade and commerce during the 18th century. It was a major hub for the export of textiles, silk, and diamonds. The Dutch, Portuguese, and English had established their trading posts in Surat, making it an important center of international trade.

Masulipatnam: Masulipatnam, located on the east coast of India, was another important port city during the 18th century. It was a major center of textile production, and the Dutch and English had established their trading posts here. The port was also a hub for the export of rice, tobacco, and indigo.

Madras: Madras, now known as Chennai, was a major port city during the 18th century. The British had established their trading posts here, and the city was a major center of textile production. The port was also a hub for the export of rice, tobacco, and indigo.

Calcutta: Calcutta, now known as Kolkata, was a major port city and the center of British trade in India during the 18th century. The British had established their trading posts here, and the city was a major center of textile production. The port was also a hub for the export of jute, tea, and opium.

In conclusion, the emergence of new trade routes and ports in India during the 18th century facilitated the exchange of goods and ideas between India and the rest of the world. These ports played a significant role in the development of the Indian economy and helped India establish its presence in the global market.

Dont know