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..
Immigration-1830s to 1850s. immigration increased because there was a demand for labor because of the economic expansion; there was a majority of immigrants coming from either Germany or Ireland; about 90% of the 4 million people entering the U.S. would head to Northern states (replace mill girls, etc.). î î î.