Question

Impact or effects of the Holocaust on the Jewish population.

Two to three sentence "call to action" that explains what we can do in the world to prevent future genocides

Answer 1

You might be able to find some information on this at the United States Holocaust Museum's website:
http://www.ushmm.org/remembrance/dor/resources/takeaction.php?content=2013

But the most important thing that people can really do whenever they see injustice like this, or any injustice for that matter, is simply to do something -- anything -- about it instead of standing at the sidelines hoping it won't happen to them. Like an old poem from Martin Niemoller goes in criticizing those Germans that stood by when the Nazis came to power:

First they came for the communists,
and I didn't speak out because I wasn't a communist.

Then they came for the socialists,
and I didn't speak out because I wasn't a socialist.

Then they came for the trade unionists,
and I didn't speak out because I wasn't a trade unionist.

Then they came for me,
and there was no one left to speak for me.