What are three moves of immigration of the USA?

What are three moves of immigration of the USA?

①The first of these waves began in the mid-1810s, grew steadily during the 1830s and 40s and reached the highest point in 1845. English oppression and the Potato Famine of 1845-1849 drove 1.5 million Irishmen from their homeland to the United States in the decade of 1845-1854.
②The second wave covered the period between 1860 and 1890. ③The third wave, the largest of the three waves, bringing to the United States a total of 15 million immigrants between 1890 and 1914，was drawn very largely from Austria-Hungary, Italy, Russia, Greece, Rumania and Turkey.