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..
The U.S. issued The Emergency Quota Act of 1921 which limited the total number of immigrants allowed into the country. It also favored immigrants from western Europe. So the change was that instead of all immigrants coming in at once, it was limited.This affected the U.S. because, simply, it caused a dramatic drop in immigration to the U.S.he Immigration Act of 1965 abolished the national-origin quotas that had been in place in the United States since the Immigration Act of 1924.