I have two questions for this issue.
1. Generally, if the result of a sinful action leads to a better purpose, that means if you dont do that specific action you will automatically commit a worse sin, then it is allowed to do this action which is forbiden in normal conditions. For example it is haram to eat pork meat but if you starve to death out of hunger and it is the only food you have, you can eat it. Because it is fardh to keep yourself alive and haram to let yourself die. So, if the result of not being able to go to America causes a worse haram than riba, isn't it considered halal? Though I dont know the circumstances of this example.
2. Is taking loan with interest really haram? Because I need money and they are source which supllies it. Yes They must give it without interest(usuary) Islamically. But they dont and this doesn't help my condition of being in need of money. I still need it. They for sure commit the sin but do I?