Nationalization Of Education: The centralization of education in modern western states allows propaganda to be easy spread to millions of students in a country. Jews often occupy school boards and influence the curriculum through non profits in the United States like college board, which is the organization that is responsible for AP class exams in the United States. If they can't force the indoctrination by lobbying laws that make holocaust education mandatory they poison the brightest whites in gifted programs or students that enter state and elite college campuses.

Elite Colleges: The status of elite colleges makes them the defacto standard on education and political topics. Jews heavily control these institutions and many of the brightest whites are poisoned by anti-white propaganda.

Television: Owning every major news network and channel allows a hostile ethnic group to indoctrinate a entire nation. The television is also extremely dangerous because the visual and audio feedback in the brain improves the efficacy of propaganda that a newspaper or radio cannot compete with. Your brain cannot parse the difference between a memory on the television and real life. The average person is unable to experience everything shown on television and every experience they haven't experienced in real life is often occupied by the hyper reality version on television.

Movies: Jews basically created and control Hollywood. America exports its sewage propaganda to the world.

Social Media: Jews influence and control every major social media platform in the United States either by occupying positions on the board of directors or by proxy organizations like the SPLC and the ADL. Social media is instant feedback and the tools are structured to create a dopamine feedback loop that makes people addicted to it. Also in the past 10 years they have created advanced heuristics and algorithms designed to curate content and censor wrong think.

TLDR: The advancement of communication technology and centralization of major institutions increases the efficacy and dissemination of propaganda.