In contrast to many native-born jews, most yiddish-speaking jews who arrived in the united states from eastern europe after the 1880s were

Most Yiddish-speaking Jews who arrived in the United States after the 1880s were from Russia, Ukraine, and parts of central Asia (such as present-day Kazakhstan).  Many were fleeing the pogroms (anti-Jewish riots and attacks) being conducted in Russia and the Ukraine.  The primary difference is that most Jews who arrived during this time period were Yiddish-speaking Hasidic Jews, rather than native-born Orthodox Jews.  

Spanish conquistadors demanded labour from natives.