It's in the interest of a nation to implement rules that boost its economy. Wanting foreigners to prosper over your own countrymen is akin to betraying your country. How is this ethical point even a question?
Your argument proves too much. Surely, you agree that its not okay to murder a foreigner if it boosts your country's economy. But you do think its okay to prevent your fellow American from hiring an Indian if it boosts America's economy. Why?
Note that I'm not arguing that you should be required to hire an Indian. I'm just saying that you shouldn't be allowed to prevent Bill Gates from hiring an Indian just because said Indian will do your job for half the money.