Opa Trump got rich with brothels and liquor during the gold rush in the US. Not because he was such a hard worker and awesome bussinessman that he pulled himself by the bootstraps into the millions. But by the fortune that he found enough women to exploit and that there were a lot of lonely men paying for it in gold.

I believe he would have never had the chance to make big money in europe at the time. He wouldn't have skipped out on military service and would have been conscripted early into WW1 and would have possibly died at the Somme or Verdune. The family would have sunken into poverty and obscurity without a breadwinner and nobody would have even heard of any of these Clowns.