Why not? I know in Poland I am not taxed until I sell the stock; and if I am out of the country for X amount of time, I am not considered a taxed resident. I a

Why not? I know in Poland I am not taxed until I sell the stock; and if I am out of the country for X amount of time, I am not considered a taxed resident. I am fairly certain the US is different, but I know that I can do that in Europe.