Prior to and during WWII were Jewish people treated as inferior around the world, or was Germany and it's allies the only people who wanted rid of them?

Anti-Jewish sentiment has an unfortunately long history in Europe, and it was by no means centered on Germany. Indeed, if you were to travel back in time to the year 1900 and tell Europeans about the Holocaust (but not where it happened), Germany would most likely not be their first guess -- France or Russia might be!

Up until the 20th century Germany was, in fact, relatively progressive in its treatment of and attitudes towards Jewish people, a product of the increased religious tolerance introduced during the Enlightenment by leaders like Frederick II. Contrast this with states like France, where systemic anti-semitism resulted in high-profile cases like the Dreyfus Affair, or parts of eastern Europe, where literally hundreds of pogroms took place in the Russian Empire in the nineteenth and early twentieth centuries as a result of widespread popular anti-semitism.

It is useful to distinguish between a few different kinds of anti-Jewish sentiment. Historically, there was by the early 1900s a long-standing strain of religious anti-Jewish sentiment, a Christian feeling based in the conviction that Jews killed Jesus Christ and based on misperceptions of Jewish religious practice. Social anti-Jewish sentiment existed across much of Europe as well, a strain that did not necessarily feature any sort of political discrimination, and indeed did not necessarily mean boycotts or avoiding Jewish businesses or professionals, but did mean avoiding social interaction, looking down on intermarriage with Jewish families, etc. Finally, at the turn of the nineteenth and twentieth centuries there was an emerging brand of pseudoscientific biological racism, based in a (mistaken) belief in the biological inferiority of Jews and other races. (I say "mistaken" not only because the idea of inferiority is mistaken, but also because the belief in biologically distinct races itself is mistaken.)

Such biological racism was not necessarily eliminationist. Indeed, the goals of Hitler and the Nazis were initially limited to protecting the German nation from Jews and other "undesirables"--i.e. removing them from society, politics, the economy, etc.--rather than elimination. Nazi Germany only moved to a policy of elimination over time, largely in response to circumstances. Prior to World War II, a policy of social exclusion sought to drive Jews from Germany by eliminating rights and generally making life uncomfortable. With the invasion of Poland, however, millions more Jews came under Nazi control, and a policy of concentration (in camps and ghettos) gained currency. Finally, with the invasion of the Soviet Union, and the subsequent increase in Jews and other undesirables under Nazi control, officials sought a "final solution", moving finally to a plan to eliminate the Jewish population of Europe.

Not all of Germany's allies agreed with this policy. In Italy, Mussolini famously had a Jewish mistress and referred to Hitler's racial ideology as "delirium"--cooperation with the Nazis in their efforts represented more a matter of pragmatic foreign policy than anything else.

And others who were not "allies" enthusiastically helped the Nazis; stories abound of German troops moving into Poland and other parts of Eastern Europe and the local population voluntarily rounding up the Jewish members of their community.