This depends greatly on the time period in question, since for a long time it was Irish immigrants who were coming to the United States in great numbers, but yes, mostly it was German immigrants.
A christian idea, to liberate from social, economic, and political oppression.
Earliest human migrations and expansions of archaic and modern humans across continents began 2 million years ago with the migration out of Africa of Homo erectus. This was followed by the migrations of other pre-modern humans including H. heidelbergensis, the likely ancestor of both modern humans and Neanderthals. Finally, Homo sapiens ventured out of Africa around 100,000 years ago, spread across Asia around 60,000 years ago and arrived on new continents and islands since then.
Knowledge of early human migrations, a major topic of archeology, has been achieved by the study of human fossils, occasionally by stone-age artifacts and more recently has been assisted by archaeogenetics. Cultural and ethnic migrations are estimated by combining archaeogenetics and comparative linguistics.
The political system that emerged was the rise of fascism. It is written at the ending of line 1 and beginning of line 2 (on the political right, fascism came out of the war).
