You can write about that they believed that there's very little importance in hiding their bodies completely (covering with clothes), which should be a simple argument.
They also had very simple housing. It was nothing more than a bunch of sticks covered in some sort of fabric like llama fur or whatnot.
http://www.uic.edu/depts/ahaa/classe...1/crowtpe1.jpg
Because there were so many different tribes, they just a bunch of groups of people, rather than a colony, so when attacked by the Europeans, they couldn't give off a fight. They just hoped to win by surprise because the rest of the Native Americans wouldn't really help. In fact, they often spoke different languages, so they couldn't even communicate well.
Their government system also wasn't exactly the best because each village had its own council, which was made up of random group members. I don't believe they had anything like a president or anything of the sort to lead the entire Native American population
When they needed to trade overseas, they traveled by canoes or a sailing raft, which is obviously a poor way to go.