They were even invited by the Russian czars, like Peter the Great and Catherine the Great. They took their belief with them and practiced it in their new homes. They built their own cities in Russia, from Novgorod in the north to Odessa in the south, with a guarantee from the czar that they could keep their own law and religion. I find it interesting that in these contracts, or, better, these letters of guarantee, the Germans were forbidden to proselytize members of other churches. In order to ease tensions, they were allowed to proselytize only among other German immigrants, who usually were Protestants.
Immigration is no longer possible, at least on a broad scale.
There is no empty space left for people suffering from religious discrimination and persecution. In a treaty between Prussia under King Frederick the Great and the United States, signed in 1785, we find the following clause, probably a first in an international treaty. Article 11 of this contract says, The most perfect freedom of conscience and of worship is granted to the citizens or subjects of either party within the jurisdiction of the other. This contract was valid from 1785 to 1917. Frederick the Great said, Every man may be saved according to his own religion.