Final answer:
India became increasingly important to Britain after the establishment of a railroad network, leading to greater trade and political power. However, this partnership was unequal and resulted in the exploitation of India's industries and people.
Step-by-step explanation:
After the establishment of a railroad network in India, the country became increasingly important to Britain. The British exploited India's resources by extending railroad lines from port cities into the hinterlands, allowing for the transportation of materials for export. This led to a significant increase in trade between Britain and India.
Moreover, the railroad network promoted national unity and increased political power. However, this partnership was unequal, as it greatly favored the British and resulted in the exploitation of India's industries and people.