The Federation of the USA was based on the Iroquois Federation, as largely was the system of representative governance as well.
What raping and murder? The ones visted upon them by European invaders permissable because they weren't Christians? How many millions died in this uncelebrated holocaust, not for dinner, but for greed and sport (It was still legal to hunt for Amerindans simply for fun in Brazil's Amazon till 1921)? Don't forget to toss in the huge people snatching eagles, city of gold, fountain of youth, giant Indians, and the mermaids that Europeans documented raping. Yeah, mermaids. Raping.
Within a 10 years of Cristobal Colon landing on the christened island of Hispaniola, 100,000 Tainos were reduced to 10,000. Care to take a guess how? Natural causes?
This quick reduction of population as well as resistance to slavery gave the 'civilized' Spanish reason to bring in slaves from Africa. Need I fill you in on that? Cristobal Colon and later his brother where so brutal in raping and pillaging and murdering that they were removed from their positions and arrested. Cristobal died in disgrace in Spain, hardly the heralded discoverer he was posthumously sainted into.
When they entered Mexica (where ritual sacrifice, etc, of enemies did occur), the Spanish fella who documented it all had described Tenochtitlan as the greatest and most beautiful city he had ever seen, and he had been to all the worthwhile ones in Europe (whose populations it dwarfed, btw). This was fed by superior farming techniques and an order of society not as yet witnessed by the just-crawling-out-of-the-dark-ages rambunctious Europeans. The Euros didn't even bath, fer cryin out loud, and stank really bad.
Today, the Mexica are extinct.
The Spanish trail from Florida West in search of the mythical El Dorado was on heckuva shindig, as you already know. You also know of the Mississippi Mound Culture (earthern pyramids in a land with no suitable stone for construction).
75% of all agricultural species used today came from the Americas. Know how many came from Europe? The bunny rabbit.
The Mexica, Guatemaltecas, and the Incas invented their own writing. Europe was given it, as well as numbers and math, from the East. The Guatemalteca calander is superior to our Gregorian one we use.
Yes, the USA invented things not ever seen anywhere ever. That includes back in Europe, where everything they had had come from the Middle East.
History is a thang, ya know.