Migration in the process that people leave their home to move to other countries in groups or individual for many reasons. Throughout human history, many people have left the place where they were born with the hope of a better life for themselves in the new land, legal immigration of people across the globe have risen 50% in the last 25 years; with 3.2% of the world population - 232 million people are migrants. In the world history, the two largest flows of migration are to Europe and to North America, especially United States. Specifically, one immigration flow is to US from Mexico, Asia and Europe; the rest flow is to Europe from Africa.
The US has the largest number of immigrants in the world with 48 million people, representing 20% of total global migrant population. Nearly one-half of them were born in Latin America and one-fourth each in Asia and Europe. Immigration from Mexico is the most notable,
They are mainly directed to the United States, there are about 11 million Mexican live in the US. Migration is very difficult and hazardous for those who want enter to the US illegally across the border between US and Mexico. Most of immigrants came to US seeking economic opportunities, they are starving in their homeland so they have to choose for stay or take a risk in another country. Most Europeans moved to United States in two waves: at the time from 1820 to 1920, these people leaved to finding freedom and religious issues; and immigrants in the 20th century leaving under poor economic condition. Nowadays, those who moved into the US from Europe mostly are young people, who are proficient in English and have high level of education as well. They also tended to work in high-skilled jobs and listed in second class in US. For the wave from Asian, migration expanded altogether after the 1965 Immigration Act adjusted. At first, in order to reduce immigrant waves from Asian the US government had some preferences for