They say the US is the most dominant industry anyway, and that half of the companies in the S&P500, while being considered of the US, are actually international.
By the way, how not being in the US worsen my situation?
Your spending is in Shekels, in Israel, while your earning is in USD invested mostly in US. This is another additional layer of risk that US investors do not have.
Imagine the scenario that your funds did okay, but then shekel strengthened a lot, or that you had a massive inflation in Israel!!
It is not as completely far fetched as it sounds. Let's assume there is lasting peace in Middle East, and you will likely have capital flowing in there and the currencies strengthen a lot. In that *good* outcome, you will stand to lose a lot of your money due to currency headwind because your money/investments are working in USD and are denominated in USD!!!
Typically, people suggest you have some exposure to your home market, and then diversify using global. I am not qualified/knowledgeable enough to give you any kind of advise as to the exact numbers. In your shoes, however, maybe I will start with this (**warning** non-professional, amateurish opinion):
1. Perhaps you can invest a third or so of your money in iShares MSCI Israel ETF (EIS). This will provide hedge against your home currency suddenly strengthening.
2. The other two third can probably go to VOO (if you are adventurous and risk taking and bet that US will do better than the rest of the world) or VT (if you are more risk-averse and don't want to make any such bet). I am not very highly hopeful on the long term growth prospects of EU, what with their demographic headwind, so would be very tempted to choose VOO/VTI myself.
Warning again - I am in no way qualified to give advise here, these are just amateurish opinions of an internet stranger and please take it as such.