Causes of migration

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Causes of Migration:
The causes of migration are varied but are almost always linked to a combination of circumstances in the home country, such as the lack of social and economic opportunities and the perception of opportunity in the receiving country. Other causes are familiar, international conflicts, politics.
Immigration reached a much higher peak in the XX Century to North America.
NorthAmerica is a region of immigrants.
In the past 30 years, the number of international migrants has more than doubled, to an estimated 191 million worldwide[1].
These include economic migrants compelled to move to provide for their families, refugees and internally displaced persons fleeing persecution, and victims of human trafficking. The vast majority are economic migrants who have few optionsto remain in their countries of origin. There are roughly 30 to 40 million undocumented migrants worldwide, comprising around 15–20 percent of the world's migrant population. An understanding of the forces that favor or necessitate migration is necessary if we are to maximize benefits and minimize harm to migrants, their families, and sending and receiving nations.

Types of immigrantsDecades:
The Great Wave of Immigration began in 1880 but exploded into peak numbers during the first decade of the century. The massive numbers of immigrants reached a cumulative total changed the character of the entire country. From towns and farms into urban centers. This decade saw more growth than any previous decade in North America history. Because of the population growth hugesections of natural resources ere destroyed. The number of immigrants in USA was 8,795,000.
The number of immigrants in Canada was 1,500,000
World War I slowed immigration considerably during the middle of the decade.
The number of immigrants in USA was 5,736,000
The number of immigrants in Canada was 1,400,000

North America rose up in revulsion at the incredible pace ofchange and congestion caused by the previous two decades of immigration-driven population growth. By 1925 in US, Congress had reduced immigration numbers toward more traditional levels. The annual population growth rate at the end of the decade had been cut almost in half from the beginning. But very high immigration of the first half of the decade, and the momentum caused by the high fertility,helped the 1920s to set yet another record for highest population growth.
The number of immigrants in USA was 4,107,000
The number of immigrants in Canada was 1,200,000

The Great Depression Decade
The 1924 immigration law and the Great Depression kept immigration below traditional levels. USA greatly reduced their fertility to respond to the dire economic times,cutting total population growth for the decade nearly in half from each of the previous three decades.
Deportations of immigrants who had organized or participated in strikes or other organized labour activities. Ralph Webb[2] campaigned to deport and prevent the admission of communists and agitators. He urged the "deportation of all undesirables".
The number of immigrants in USA was 528,000
Thenumber of immigrants in Canada was 149,000

The Baby Boom Decades
The baby boom describes a period of increased birthrates lasting from the early 1950s to about 1965.
The great depression of the 1930s had prolonged the decline in North America’s birthrate, as it had in most Western countries.
The baby boom began with the births of children who had been postponed during theDepression, but 2 other factors affected it as well. First, a larger proportion of adults married, and those who did had more children. Second, more than 50% of baby-boom births can be attributed to what demographers call "timing phenomena." More adults married at a younger age, and between the end of WWII and 1965, young couples tended to have their children during the first few years of...