Well, America never entered into a defense treaty with Poland.
There was no defense treaty but there was presidential election, during which Roosevelt made promises and gladly took photo-ops in front of a map with Poland's borders promised to the Polish-American voters to be the same as pre-1939
Sorry, I simply asked my GF who is actually a student nurse. Polish nurses now have English lessons and have to pass English exams in order to qualify.
Before you said it was a job requirement. It isn't.
Now you're saying that "Polish" nurses have to pass English exams. That is not true either. In some schools English is among compulsory subjects, in others it is not.
Canada also showed what they think of the Czechs recently by stripping THEM of visa-free travel rights due to too many illegal Czechs living there.
That's kinda true. The visa requirement was imposed indeed, but the culprits are only sorta Czechs, but most not really.