My sister's children can be adopted. Can I apply to study in the United States?

According to relevant information, the query shows: Yes. According to American immigration law, you need to meet the following four conditions to apply for immigration:

1.2/kloc-Unmarried children of American citizens under 0/can apply for immigration, and there is no quota limit;

2. If the child is over 2 1 year old but unmarried, it belongs to the first priority category.

If the child is married, it belongs to the third priority category.