For example, the 3 million who arrived between 1845 and 1854 landed in a country of only about 20 million people, so they represented about 15 % of the total population. English oppression and the Potato Famines of 1845-1849 drove 1.5 million Irishmen from their homeland to the United States in the decade of 1845-1854. 例如，在1845年到1854年间，有300万移民来到了一个只有2000万人口的国家，他们约占当时人口的15%。英国的压迫和1845-1849年的马铃薯饥荒迫使150万爱尔兰人在1845-1854年的十年里离开他们的家乡来到美国。