Changes Between 1776 And 1870

Between 1776 and 1870 there were many pivotal changes in the history of the United States. Some of those changes between that time period were for example the change in population due to the fact that many people were immigrating to the United States due to slave trade. Another change in this time period was all the new innovations created for example roads and many other new inventions. Also another change was the writing of the Declaration of Independence which gave freedom from the British.
First of all the first change between the time periods of 1776 and 1870 was the change of population. One of the reasons why this is a change is because of slavery taking place, because of this many people from other parts of the world are being brought