It depends on the work but i think 4 is good
Well Rome conquered many countries and people but the first ones were probably the Carthaginians. It could also be the Jewish, Germanic tribes, Celtics, etc.
Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well.
