Those who credit american ingenuity and exceptionalism must acknowledge land is by far the most precious commodity, an entire continent and a beautiful and rich one like North America is essentially priceless, and will enrich generations to come till the end of time. Much much more than $90 or $900 trillion. The economic value of this immense tract of free land and slave trade cannot be brushed aside.
But there is also credit to the courage and ingenuity of the early immigrants who took perilous journeys leaving everything behind, risking diseases and an unknown and uncertain future, and made something out of it.
One would like to think those who are proud are proud of this and not the usurpation of a continent or slave trade.