Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, it was occupied by Nazi Germany.
fˈɑːloʊɪŋ ðə dʒˈɔɪnt dʒˈɜːmənsˈoʊviət ɪnvˈeɪʒən ʌv pˈoʊlənd, wˌɪtʃ stˈɑːɹɾᵻd wˈɜːld wˈɔːɹ ɹˌoʊmən tˈuː ɪn sɛptˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi nˈaɪn, ɪt wʌz ˈɑːkjʊpˌaɪd baɪ nˈɑːtsi dʒˈɜːməni.