This is not limited to Jews, basically any difference the political class can find to explicit they will.
Japan an Ethnically homogenized country? Use Class warfare.
United Kingdom politically united? Pitch Catholics against Protestants.
The Untied States is a giant melting pot of cultures? Put a stop to that and put everyone against each other.
In that path lies power for them, but civil unrest and war for the rest of us.
THIS IS NOT WHAT JEWS BELIEVE ABOUT GENTILES!
I know sf4dubya seeing how I am from a family of both. We just need to teach that to others.