Answer:
<h2>Labor unions. In 1883, " The railroad industry" was responsible for creating the first system of time zones in the United States. This answer has been confirmed as correct and helpful.</h2>
Explanation:
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Well..as far as i learned from my knowledge the answer would be in the past, the military and the FBI have prevented a number of terrorist attacks.
Secondly, wasn't there suppose to be an option answers for your question ?
<span>The constitution provides that the president has the power to approve a treaty, it was from Article 2,Section 2.
Sources:U.S. Senate:Treaties</span>
Chinese Americans faced the brutality of the Irish, who were the main competition for jobs. Labor Unions also disliked the immigrants, who were used as 'strike breakers' because of their need for jobs. After the Chinese Exclusion Act, the Chinese still created there own new element of American Society--Chinatown.