Has antisemitism changed over time

actually yes

Explanation:

in the old ages the Jews basically ruled Jerusalem (hence the name) and people hated them for the way they treated the people there, not their religion. When Hitler came to power many years later after they had lost the rule of Jerusalem people started hating them for the way they horded money and their religion. Now people just hate them for their religion.

So yes antisemitism has changed over time.

a) hostility to or prejudice against jews.

b) the holocaust, also referred to as the shoah, was a genocide during world war ii in which nazi germany, aided by its collaborators, systematically murdered approximately 6 million european jews             , around two-thirds of the jewish population of europe, between 1941 and 1945.

the name of the theory is landmass theory.