Well, the territory was huge, and largely, the documentation we have comes from larger European-colonial settlements rather than Indigenous peoples or enslaved people, who were vastly impacted but denied a voice. So we're working with a slim margin of the population.

My area of focus is New Orleans, and I can speak to that. Frankly, French colonists and creoles wept in the damn streets. They hated the idea of being American. They didn't want to be American. They had managed to get along well enough with Spanish control of the territory, and there had been a fair bit of intermixing between Spanish and French families at the end of the 18th century. But with the transfer of New Orleans from Spanish hands to French hands for a hot ten minutes to American hands, people watching the raising and lowering of flags in the Place d'Armes (modern-day Jackson Square) wept and wailed, despite the American military presence and the pomp of a gun salute.

This resulted in one of the most well-known neighbourhoods in the US today -- the Vieux Carré, or the French Quarter. The old creole families stuck to that small area around the river, the Cabildo, and St Louis Cathedral. Across modern Canal St and heading up to the Garden District was the "American Sector" of New Orleans. White Americans eschewed the tiny French and Spanish style houses of the Quarter and built their elaborate mansions in the Garden District, giving that part of the city its distinctive architecture. In the run-up to the Civil War when New Orleans was a massive port for Southern cotton, planters prided themselves on having a big, elegant New Orleans house. But the creoles kept to themselves. It was only after Reconstruction when race became more important than language that the barrier came down. It took Civil War and Jim Crow to get New Orleans Creoles, both French/Spanish Creoles and Creoles of Colour, to see themselves in terms of being American and race rather than their linguistic-cultural identity that unified them for half a century. (Homer Plessy of Plessy v Ferguson was a white-passing Creole of Colour, and much of his defense in Louisiana was that he was a Creole, not "coloured," which didn't fly when the case hit the Supreme Court.)

So we know that white folk were devastated. If anyone has resources on what enslaved people or other people of colour in Louisiana Territory thought of the Purchase, I personally would love to see it.