Fidelity has different retirement funds based on the expected retirement year. Each fund invests in four areas: US Stocks, Foreign, Bonds, Junk Bonds, and Money Market. Looking at 11 funds between the year 2000 and 2050, the percentage of investment in US Stocks climbs steadily from 25% in 2000 to 68% in 2050. The Bond percentage drops steadily from 30% in 2000 to 9.9% in 2050. The Foreign category is interesting - 0.5% in 2000 to 21% in 2050, with 2030 being the crossover where the percentage of investment in foreign funds exceeds that of us bonds. High-Yield bonds (which im calling Junk Bonds) are not a big player and 37% went to a money market for the 2000 fund before being eclipsed by bonds.
I think Fidelity is saying the world will look very different by 2030. The US will no longer be a superpower. That title may go to China or maybe noone will stand out as before and we'll be more like countries in the EU. I turn 65 in 2035 (a few years before 2038, the unix epoch).