1. In which year did the most Germans come to America? When did the most Irish come to
America?

Germans: More than 1.5 million between 1820 and 1860. The 1850s was the single biggest decade for German immigration, with some 951,000 reaching the United States. Why They Came Irish: Most emigrated to escape grinding poverty in Ireland—or to avoid outright starvation in the years of the potato famine.

Explanation:

the answer is "by providing data about careers and annual mean wages"