Which event contributed to the rise of ani-immigrant, anti-socialist, and anti-anarchist feelings in the united states in the years during and after world war 1?

The rise of antisocialist, antianarchist feelings in the United states in the years during and after the World War 1 was a consequence of the increased influx of immigrants. Another thing was that the general US public witnessed a changed world in the wake of the ending of the bloodiest conflicts in human history. All of this lead to a number of different sentiments among which are those that were listed in the question.