You may not have any direct investments in the US, however whatever assets you are invested in is likely to be affected by what happens in the US economy to a smaller or larger extent.Explain?
The simple example would be if you were invested in Novartis (a swiss pharmaceutical). You would still have huge exposure to the US as they make much of their profits in that market. Probably your exposure is lower than by investing in Merck ... but I would have to look at the numbers to be sure.