What factor allowed india to play a key role in global trade during the gupta empire?

India was located close to China, which produced most of the world's trade goods.
India produced most of the goods that other countries were looking to import.
India had access to major waterways, which allowed for easy shipment of goods to other counties.
India was a central location between the East and West, which made it a trade hub.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.