A. flammability because it changes more than just its physical feature
The French who had direct contact with the Americans were able to successfully implement Enlightenment ideas into a new political system. The National Assembly in France even used the American Declaration of Independence as a model when drafting the Declaration of the Rights of Man and the Citizen in 1789.
The answer is the building o large mounds for burial grouds
They had developed immunities from being around them for so long, while they were new and foreign to the native Americans