Board Thread:Fanmade/@comment-29981284-20170311154302/@comment-43557733-20200912190419

The only Hamon monks left post-part 1 were Straizo and Tonpetty. Also, the pillar men would likely not be found since Dio would make it a point to kill off Speedwagon and the hamon users. There'd also be no Joestars left.

If the Pillar Men were found by the nazis, assuming Dio hadn't turned everyone into a zombie at that point, then they would probably awaken and find out that DIO had infected millions of people with vampirification. They would then proceed to massacre his army and tie him to a place where the sun would make quick work of him.

However, before that, he could probably take over the country in a couple days, and then the entireties of Africa, Asia and Europe within a year. The USA would defenses planted but they'd be powerless against a vampire siege. However, if they decided to utilize boats, due to the time it would take for vampires to reach the coast, they probably wouldn't be able to make the journey without heavy casualties.

In short, Dio either takes over Earth or the Pillar Men kill him and take over Earth.