The chart above is from the Morning Consult Poll. Between August 24th and 30th, they surveyed 47,351 adults in the United States and between 2,275 and 5,824 adults in several other countries.
It shows the United States is an outlier compared to other countries when it comes to the percentage of people who have taken (or plan to take the COVID-19 vaccine. Only 56% of U.S. adults say that, while the percentage is much higher in the other countries.
Those other countries are treating the virus seriously, and don't have Republicans feeding them misinformation (as is happening in the U.S.).