The answer is simple…Opportunity.
US stocks only make up 54% of the global equity market. That’s a 46% chance that you are missing an opportunity. As they say, past performance does not indicate future results and, the pendulum is bound to swing back in favor of international stocks over domestic at some point.
We cannot time the market, so your best bet is to have a diverse portfolio that is represented with domestic, international and emerging market equities so that you aren’ missing opportunities amid market shifts.