There was Increased Patriotism in the United States. The U.S. military and manufacturing was strengthened. There also was a big decline to federalism.
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1) Thomas Jefferson's Declaration of Independence- This formal document drafted by Jefferson and others (like Ben Franklin, John Adams) was America's official breakup with the British Empire. This document included a list of rights that citizens should have as well as grievances they had against the British government. After this document was ratified, America would no longer be under the control of Britian. This had a tremendous impact on the Revolutionary War, as America had been tied to England (politically, socially, economically) for over 150 years.
2) Thomas Paine's Common Sense- This pamphlet developed by Thomas Paine discussed numerous reasons as to why America should break up with Britain. Some of his most important ideas include the fact that Britain is thousands of miles away from America and do not fully understand American society. Along with this, Paine thinks that America would have more financial success without being forced to trade with Britain. This had an enormous impact on the Revolutionary War, as it caused citizens to critically examine their relationship with Britain. At this point in time, very few citizens have examined this relationship in depth like Paine did.
There was great tension between pro-slavery and anti-slavery representatives over how new territories won would handle the issue of slavery.
The Mexican-American War and the 1848 Treaty of Guadalupe Hidalgo, forced onto the remnant Mexican government, drew some criticism in the U.S. for their casualties, monetary cost, and heavy-handedness. Furthermore, the question of how to treat the new acquisitions also intensified the debate over slavery and in many ways inflamed it, as potential westward expansion of the institution took an increasingly central and heated theme in national debates preceding the American Civil War.
An example of separation of power is having different branches of government that perform different duties, for example the legislative, executive, and judicial branch. Instead of having government concentrated into the power of one person