Which expedition, which included astronomer thomas freeman, traveled to present-day oklahoma and was forced by the spanish to cease exploration and return to the established american territory

Hee the american public did not truly take in the horror of adolf hitler's regime until years after the existence of concentration camps was first reported in american newspapers. partly this was the fault of the media, which did not give prominent placement to news of the holocaust. what other factors do you think contributed to the long delay in understanding the holocaust?