Did the Indians cut down all the trees?

Had a great class today with 7 year olds. Great, not in the sense of them learning English, because they didn't learn any, but great as in entertaining. Last week we made hand turkeys for thanksgiving. But in France, they eat turkey for Christmas, and by the time we had finished our Turkeys, they had forgotten about Thanksgiving and started thinking about Christmas. So today I re-explained Thanksgiving to them, this time in more detail, and asked if they had any questions. I clearly had not mentioned Indians the last time (there is no PC French term, so I'm just going to go with Indians here) I asked if there were any questions. Wow. There were a few good questions like where in the USA the Indians lived. I explained that they were forced west by the colonists over time. Then a student asked why the Indians would teach the colonists how to grow food. That got right to the point. But most of the conversation went like this: S=student M=me T=teacher
S: So there were Indians at the time?
M: Yes and there still are, just not how you think of them.
T: Without the feather.
S: Were there crocodiles at the time?
M: Yes, but not where the first thanksgiving was.
S: Were there crocodiles during the time of the Dinosaurs?
M: Something like that
S: And the Indians lived in tepees?
M: Actually the Thanksgiving Indians lived in long houses made of wood. Other groups lived in tepees.
S: Oh! So was it the Indians who cut down all the trees?
S: Were there scorpions at the time?
M: No, we still have trees, and there were scorpions but not in that part of the USA.
S: Snakes?
M: Yes.
S: Do turkeys live in the desert? How did they grow food in the desert?
M: The eastern US is forest, not desert, like the north of France. There were no scorpions there. Turkeys don't live in the desert they live in the forest. Where thanksgiving was.
S: Did the Indians have horses? And the cowboys!
S: You know those big saws that two people use together? Is that an Indian tool? Is that how they cut down all the trees?
M: The Indians didn't cut down all the trees. That big saw was a colonist's tool.
S: Oh! Did they use their tomahawks to cut down the trees? Were there Bison?
M: There were Bison, but in the West, this happened in the East, in the forest.
S: Did they have hatchets? How did they hunt the bison?
S: So there weren't scorpions? Like in France?

So on and so on for half an hour. I'm going to make a map with nature pictures for each region of the USA. I'm going to have to bring them pictures because I don't think I managed to convince them that we still have trees in the USA, and I'm pretty sure they blame the Indians for the deforestation.