whether directly or through mutual funds -- and in my experience from the names and one-paragraph descriptions of mutual funds, they indicate whether or not they are a U.S. stock fund or not (i.e. whether they hold foreign stocks or not).

If I were running for president on a "jobs jobs jobs, where are the jobs?, when I'm president, I will create 12 million jobs in my first term" platform (paraphrasing), I'd first, long ago, have scrubbed my investments of non-U.S. investments, which isn't hard to do....