The United States had made many changes in the years 1776 and 1870 for many reasons. One reason is that the changes all started because of the declaration of independence. The second reason is that there was a drastic change in population. The third reason is that there were new innovations made. For all these reasons the years 1776 and 1870 had many changes.
The first reason that the years 1776 and 1870 were very different with a lot of changes is that it all started with the Declaration of Independence. This led to the United States to fight for our freedom. During this period in time, the constitution was ratified