Final answer:
The Democratic-Republican party had a significant number of immigrants in the late 1700s, primarily from Europe, who settled in the South and western areas of states like Pennsylvania and New York. The Federalist policies ultimately alienated a portion of their immigrant voters, especially among the German community.
Step-by-step explanation:
The political party that had a lot of immigrants belonging to it in the late 1700s was the Democratic-Republican party. This party attracted many new immigrants with radical political ideas who had fled England, Ireland, and other places in Europe. These immigrants were primarily in the South and western areas of states like Pennsylvania and New York. The Democratic-Republicans were able to broaden their constituencies by appealing to the economic outlook and sectional interests of these immigrants.
In contrast, the Federalists passed immigration acts that harmed their relationship with German immigrants in southeastern Pennsylvania, who initially tended to vote for the Federalists but grew tired of the Federalist policies by the end of the decade. This led to a shift in allegiances, with Republican leaders in Pennsylvania taking advantage of the tensions created by the Federalist government's tax assessors, resulting in political victories in the southeastern counties.