<span>The United States change socially between
1776 and 1870 when declared the 13th ammendment that abolished the
slavery. That there will be neither slavery nor involuntary serviture except as
a punishment for crime whereof the party shall have been duly convicted. Then
the 14th ammendment declared which defined a citizen as any person
born or naturalized in the US. This addresses citizenship rights and equal
protection of the laws and was porposed in the response to issues related to
fromer slaves following the Americal Civil War. Then lastly, the 15th
amendments that prohibits denying the right to vote to someone because of their
race. These 3 amendments apparently change the United States change socially. </span>
The transcontinental railroad. Because of it, goods were able to be exchanged between the west and east and Chinese immigrants mainly worked on it.
The methods that have resulted in the greatest contribution to global security were: <span>military they pledged for the common defense and the stronger and bigger the were the better protection.
Unlike in the past, the greatest military in Modern Era is not possessed by the countries that have the most soldiers, but by those who possessed the most advanced mass destroying weapons.</span>
