You know, I must say. This is an example of how different the US is from other countries.
Here if you wanted to stay, long term. You would have to ask, far in advance. You would have a much easier time.
This is why right now, there is such an argument over immigration in this country. The conservatives, would have everyone deported, who did not first apply. It seems in Germany, it is the total opposite.
Here you must have everything in order, before you come.