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Why do US retirement funds typically have way more US assets than international assets?
You need growth in your retirement fund. Sad to say but the broad U.S. marks still has better growth perspective than the emerging markets. Look at China they are only at 6.7% growth for next year the same as this year.  Russia's economy is shrinking. These are the other two super powers of 2015. The USA is still the best market to invest in historically and in the present. That's why the USA market tends to be overweight in most retirement portfolios. Now by only investing in the USA market do you miss out on trends internationally? Well you do a bit but not entirely. Many USA companies are highly international in regards to their growth. Here are some:  So in short the USA market still seems to be the best growth market and you still get some international exposure.  Also by investing in USA companies they sometimes are more ethical in their book keeping as opposed to some other markets. I don't think I'm the only one that is skeptical of the numbers China's government reports.