/kloc-the reasons for the largest immigration in the United States in the 0/8th century.

First of all, as early as the middle of18th century, Britain, France and Russia successively completed the industrial revolution and the agricultural revolution, which destroyed the original traditional economy in Europe. At the same time, the extensive application of scientific and technological achievements of industrial revolution in European society has led to the rapid decline of agricultural population in Europe and the sharp deterioration of land relations. Compared with Europe, a large number of undeveloped land in the United States needs sufficient labor to develop. In this case, the surplus labor force in Europe can only find another way to survive overseas. When they moved overseas, the United States became the best choice because of its colonial rule.