[samus]

It seems to work out with this set of countries. Croatia lets you keep other citizenships if you claim the Croatian one via jus sanguinius. German citizenship is compatible with other EU/Swiss citizenships and citizenships acquired at birth. The US and Switzerland don't care that much. In practice, such webs of multiple citizenships can become tricky if one of the countries involved has mandatory draft, but it seems you can avoid the Swiss draft if you don't live there. Finally, I don't see why there would be a need to inform these countries about additional citizenships, unless they mandate it by law.

[hiq]

> it seems you can avoid the Swiss draft if you don't live there

I think you can apply for an exemption especially if were already subject to the military draft of your country of origin. You might also be exempt if you just gain citizenship after a certain age.