How did antimitism start and why?

Antisemitism has roots that trace back to ancient times, initially manifesting in religious conflicts between Jews and early Christians. Over the centuries, it evolved, fueled by economic scapegoating, social exclusion, and cultural stereotypes, particularly during periods of societal upheaval. The rise of nationalism in the 19th and 20th centuries further exacerbated these sentiments, often portraying Jews as outsiders or threats to national identity. This culminated in extreme forms of antisemitism, including the Holocaust, driven by deeply ingrained prejudices and conspiracy theories.