Roger Sherman and the Connecticut Compromise. In Article VI of the Constitution of the United States, the framers declared, This Constitution... to be the supreme Law of the Land..
Copper gutters are very corrosion-resistant, so they will endure even in harsh conditions and areas with a great deal of acid rain. It is also sturdy, and it meshes well with a wide variety of roofing materials, including slate, cedar shakes, and composite roofing.
The cons of copper are the $15 to $30 per foot price tag, with an average cost of $23 per foot. This makes copper the most expensive gutter material. There's also a risk that copper gutters will be stripped off of your house by thieves for the metal value. This risk ebbs and flows with the price of copper.