This is going to depend which place and group of people you talk about. Suicides of Jews in Germany went up by the start of WW2 - source is Richard J Evans; Third Reich Trilogy. He had no stats about non-jews. But, being oppressed and humiliated definitely made some Jewish Germans to kill themselves. (Convolute phrase, but plenty of them considered themselves Germans, so.)

And it was much easier to commit suicide by lettin other people kill you too.

America is might be different, because it did not happened on their soil.