Back in 1945, the push for the flu vaccine was similar to what we are seeing with the SARS-CoV-2 vaccine today. In 1918, the world was hit with a massive influenza pandemic that killed more than 20 million people world wide. By 1945, we had an influenza (H1N1) vaccine available for the general public. Unfortunately, the flu is a rapidly mutating virus, meaning that we see various strains dominating each year and some can turn into pandemics. All we can do is try to predict which strains will be prevalent and vaccinate against those in a yearly vaccine. In short, the answer to your question is that there has been a global push for influenza vaccination in the past, put there isn't currently a push on the level of SARS-CoV-2 vaccination because we haven't seen a flu pandemic on the level with COVID-19 since 1918.