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Using Euros to buy and sell NASDAQ stocks
Does the Spanish market, or any other market in euroland, have the equivalent of ETF's?  If so there ought to be one that is based on something like the US S&P500 or Russell 3000. Otherwise you might check for local offices of large mutual fund companies such as Vanguard, Schwab etc to see it they have funds for sale there in Spain that invest in the US markets.  I know for example Schwab has something for Swiss residents to invest in the US market.  Do bear in mind that while the US has a stated policy of a 'strong dollar', that's not really what we've seen in practice.  So there is substantial 'currency risk' of the dollar falling vs the euro, which could result in a loss for you.  (otoh, if the Euro falls out of bed, you'd be sitting pretty.)  Guess it all depends on how good your crystal ball is.