Answer: A.Between 1820 and 1850, nearly half of all European immigrants came from Ireland, which differed from earlier waves.
Step-by-step explanation:
Ireland's Potato Blight 1845 was the cause of the start of Irish immigration into America, which caused a devastating famine among the Irish people. A million Irish people were killed due to hunger for five years, while half a million arrived in America to start a new life as their home country's living conditions were deplorable.