When my ancestors settled in Wisconsin from Ireland, Germany, and Belgium, many of them came to this state because other family members had arrived previously.
Today, this would be called family-based immigration. Some of the reasons why my relatives came to the U.S. were the same as they are today.
They were seeking freedom of religion, since most of them were of the Catholic faith. They left their home countries, where they may have had low wages and poor living conditions. They hoped to create a better life for themselves and their families. Some came to escape war and conflicts in their countries.