- Eastern Europeans were relatively numerous, with more than 350,000 listed immigrants. This included 154,000 Poles, around 40,000 Ukrainians and smaller numbers of Russians. These immigrants were searching for better opportunities - a few thousand Belarusians were also among them. Slavs from other regions migrated as well, here mainly South Slavs like Bulgarians and Croats, but also Czechs and Slovaks, with moderate numbers of Slovenes and others. Hungarians and Romanians were among the non-Slavic Eastern Europeans and were the biggest groups after the Poles, Russians and Ukrainians.