Henry David Thoreau is best known for "Walden", a book written when he was living for 2 years in a little cottage in a deep forest, and it's about living in nautre. Thoreau also wrote "Resistance to Civil Government" which is about why people shouldn't obey an unfair law. Those two books had a great impact for many later reformers.
It was Tammany Hall that was the location associated with political machines in the 19th century, since this was the place that many men would meet not only to discuss politics but also to elect members to office.
Immigrants suffered many stereotypes, they worked for minimum wage plush they had to compete against other people for a job. If I recall amendments 13-15 basically gave them rights but government exploited the rights and found ways to give them unfair treatment, for example one of the amendments gave them equal rights to those of Americans, therefore that means they would have the same punishments etc.
Well the empire was shot to death.