Peter Minuit bought it fair and square.
Minuit didn’t buy it fair and square.
History indicates he or the dutch were sold Manhatten and assorted other lands some 6 times over.
One popular history of Manhattan notes that the Canarsie Indians “dwelt on Long Island, merely trading on Manhattan, and their trickery [in selling what they didn’t possess to the Dutch] made it necessary for the white man to buy part of the island over again from the tribes living near Washington Heights. Still more crafty were the Raritans of [Staten Island], for the records show that Staten Island was sold by these Indians no less than six times.” http://www.straightdope.com/columns/read/715/how-much-would-the-24-paid-for-manhattan-be-worth-in-todays-money
And my great-great-jiggledy-squared-grandfather was there as a witness to it.
So give it back to the Dutch and see what they want to do with it.
Give it back if they meet two conditions.
1) One of the documented descendants of the seller(s) shows up, and;
2) They return the original money used to buy it, plus interest and appreciation.
But, they can’t have the buildings and other improvements. And the bums, dopers and criminals will be thrown in free of charge.
Even old New York was once New Amsterdam...