After Columbus discovered the New World, Europeans immigrated to North America in large numbers.

International international date line passes through Bering Strait, because this change line is marked manually. This "International international date line" across the Pacific Ocean avoids some islands and regions, so that they will not be divided into two dates. Therefore, it is not a straight line, but a few tortuous curves. So at the junction of Russia and North America, Alaska. One day earlier in the east and one day later in the west (geography classroom joke: how to spend two Sundays? Go to the other side of international international date line after passing through China. )