The US is not happy about the British blacklisting of certain US companies, branches of companies, and individuals. It may respond by prosecuting under anti-trust laws any US shipping companies that refuse to carry goods from blacklisted companies. The US considers the blacklist an interference with its rights, as for example when US ships doing business with South America are refused coal in British ports like Jamaica if they carry goods from blacklisted companies.
Germany’s Imperial Vice Chancellor and Secretary of the Interior Karl Helfferich says that when Germany occupied part of Poland (since retaken by Russia), it was much nicer to the Poles than the Russians ever were, including the Polish Jews. And introduced hygiene, as was the German custom.