I appreciate your sentiment, but NA has always been the recycling bin of the world. Too many Asians in Asia, so they crossed over and became the Athapaskans, Inuit, Aztec, Incas etx. Horses originated in America, migrated to Asia where the Mongols learned to tame them before they found their way back with the Spanish. A significant portion of the plant life here originated as imported weeds that thrived after incredible environmental changes, even before European settlement. I would like to see Europe become Europe again before I worry about America if not for the glimmer of hope we still have here, unlike anywhere else. Life is a dirty game, and nature doesn't care who wins.