I would focus my answer on these points (These are my personal opinions. You can 100% disagree with them though):

1. Family Tie: I have family here in Nepal so I would return to Nepal after study. Why would I live an alone life in the USA?
2. Entrepreneurship: I always have a dream to open my own business in Nepal. Or, I have my family's business which needs my support and help to grow.Thus, after graduation, I would definitely come to Nepal to achieve my dream.
3. Need of the nation: After earth quack, Nepal needs to develop rapidly to catch the pace of the world, and there are ample opportunities here in Nepal where an educated man power is needed. It will give me a chance to give something to the Nation where I am born and grown up.
4. Political Stability: Recent elections show that there is a high chance of political stability and stable government for at least 5 years. That helps many projects to commence. Thus, there will be a lot of opportunities for the people like me who would have the US degrees which is high in value in Nepal.