The migration from Mexican to the United States is a phenomenon that involves two societies and that place at concrete moments of the historical unfolding of both takes. When studying the phenomenon the situations Mexican and American, as well as the interrelations between both in each historical stage are due to take into account. Widely it isaccepted that the phenomenon is related as far as the elements of internal character talks about, with the situation that keeps the use. The origin of the problem is the little level of development reached in many zones of the country and the low possibility of growth. It is an inherited problem of mining, back agricultural time in that I leave behind economic forced to look for a place in theferrocarrilera industry, etc. Of a country ene l that those uses were not occupied by nationals (of the USA). The one is east subject that I have chosen because it represents a problematic one of first order, that is to say, the main subject to try by heads of government of both countries is the migratory one, moving others like international treaties like the GASOLINE; in addition it is important toindicate that at the moment the originating currencies of the neighbor of the north constitute second source of income of the country.
BEGINNINGS OF THE MIGRATION.
The movement of Mexican population towards the United States began from the past century when a part of the territory of Mexico happened to be possession of the United States by historical circumstances that it is not this placeto review. E1 done is that suddenly the border moves towards the south and Mexico remains with its present territory. Physically, the border is nonexistent then and the Mexicans do not find obstacle some to happen to the neighboring country; mainly from which the network of communication channels of Mexico is extended, people can move with relative facility, In particular the railroads madepossible that many people could travel from the Central Plateau of the country to the border with the United States, mainly to the southwest of that country, region that begins to experience a fort economic development based on agriculture. During the two last decades of the century XIX and 1as two first of the present, the Mexican immigrants played a very important role in the construction of therailroads in the southwest of the United States, especially those of the companies Southern Pacific and Santa Fe. The Mexican workers got to represent 70% of the groups and only in 1908 they were contracted more than 16 000 of them to the railroads. After the main routes were even finished, the Mexicans continued being contracted to construct to the secondary lines and for the maintenance and repair ofthe same. The construction of railroads took to the Mexicans to Mountain, Wyoming, Utah, Colorado, Idaho, Illinois and Washington.
• The Crisis of 1929
The 1929 crisis caused that they arose and some groups were developed that proposed restrictions to immigration and therefore that they were against the use of Mexican manpower, adducing that the Mexicans occupied positions that wouldhave to correspond to the overwhelmed North American citizens by the increasing indices of unemployment. The North American government found then to whom to blame of at least part of the crisis and organized massive repatriations of Mexican. This agreed with the policy of the Mexican government with respect to the field and to the farmers, because they were the years of height of the agrariandistribution.
THE MIGRATION AT PRESENT
Whereas the United States has promoted majors commercial bows, political and investment with Mexico, it has dealed with in vain to contain the flow of manpower through the border. Beginning with the drastic measures against illegal immigration taken in the middle of the eighty, the North American government has imposed heavy regulations on the American...