Many people decided to move from more rural areas that offered land and space for farming to cities that had factories and offered job opportunities
Agriculture because of globalization the competition in agriculture sector has increased, US has got many of India's high earning agricultural products patent in WTO (like- basmati rice ,turmeric etc) and that's why you need to pay US government for their production
Based on the information I was able to find I would say "Natural gases".
This is due to the reason it is burned to create heat for buildings which are used for several things we do daily such as cooking, heating, and electricity.
It is because the Americans started to see all the other countries become free and they wanted to become free to. They also started to not like the way the British treated them.
