A lot of the 33 previously-banned nations are in Europe, a area the WHO lately declared because the “epicenter” of the pandemic.
https://www.washingtonpost.com/nation/2021/11/08/covid-delta-variant-live-updates/?utm_source=rss&utm_medium=referral&utm_campaign=wp_national | Covid-19 dwell updates: U.S. lifts journey ban on 33 nations as Europe circumstances surge