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..
They came to the United States for a variety of reasons, most notably because of the persecution, discrimination, fear, and economic problems they faced in Russia. 2 1/2 million of the 8 million immigrants who immigrated to America between 1880-1914 from Russia and Austria-Hungary were Jews.