Immigrants have been coming to America at least since 1493. The years of greatest immigration to the United States were about 1880-1914, but immigrants continue to arrive every day.
27 million people come to America per year.
Because of the nature of the problem an exact figure cannot be known. Certainly several thousand
The average number of immigrants that immigrate to Canada each year is 25000.
The U.S. averages from 1000 to 1200 tornadoes every year.