I think this covers everything except for one last question the OP might have had. Israel was, and still is, a US ally. Trading is generally pretty open with those allies, so citizens are fairly free to invest with any company headquartered in those countries. Investing in an Israeli company was no different than investing in an Australian or UK company. Offshore investment can be smart too, as they can potentially insulate you from the effects of economic shocks in America (in the short term). I'm sure someone much more versed in economics or finances could give you a better summary of that end though.

Just in case they're wondering whether/why it's possible/common to have foreign investments in the first place. Your comment is a great explanation for why Israel specifically.