A hiatal hernia does not cause many symptoms by itself, but when a sliding hernia occurs, the abnormal location of the gastroesophageal (GE) junction above the diaphragm affects its function and stomach contents can reflux into the esophagus.
-You need to work on sentence structuring. For example, when you wrote, The immigration, as a decision maked by a person is an act that occurs, because of some factors especially in the under developed countries and the most importants causes or reasons are mainly social reasons, politic reasons and economic reasons..
Illegal Immigration from Mexico. For many generations Mexicans have illegally crossed the border into the United States. Reasons for the high rate of migration from Mexico include the close proximity of Mexico to the U.S. and the noticeable difference in the quality of life between the two countries.