<span>The Monroe
Doctrine, in defending the rights of the emancipated and free colonies
of the entire American continent, was showing a position of support and
of "elder brother" of the rest of the new countries of America. In
defending the independent colonies, in front of the European and
colonial powers, the doctrine gave citizens a sense of the country's
strength, of great stability and of having sufficient capacity to face
the empires of Europe. <span>In addition to feeling a
confidence and security that his country, not only protected the
Americans, but helped the new nations that emerged, giving an optimistic
and encouraging to citizens.</span></span>
Well an obvious answer would be slavery, depending on how late you're talking. After slavery ended, the country began what is known as the "industrial revolution". The north had already begun industrializing for a while, but in the 1870's and beyond, things ramped up quite a bit. Factories for clothes, shoes, farming equipment, packaged foods, and etc. became more popular. You also had coal mines, railroads, and steel mills. This showed the country was moving in the direction of mass production, and moving away from agricultural ways of living. This also meant child labor, which led to many child labor laws in the later years. This also meant many moved out of farming communities, and into larger, noisy, and crowded cities. Many immigrated to the US to take advantage of that, which led to some tension between communities.
Hope that helps!
The act forced citizens to assist in the recovery of escaped slaves, and if they were unwilling to assist or aided a fugitive in escaping, they were subject to a fine and prosecution. ... But the compromise made many Northerners more determined than ever to end slavery.