The Gedolim specially told people not to go to the US (Before 1924) or Israel (In the 1930’s)
There were lots of Pograms in Europe and an especially bad one in 1881 which is what caused the massive emigration to the US.
In the 1930’s it was possible to go to Palestine,I once met a woman who wanted to go to Palestine in the 1930’s I guess as a teen. Her parents asked a Psak and the Psak was no and she stayed in Europe. She did survive, but her family did not and she suffered greatly, I dont think she ever got over camps.