Twofold-B.C. and A.D.
Three fold Ancient, Medieval, and Modern
 
        
             
        
        
        
Political instability Militarism Civil unrest
        
             
        
        
        
This website says that they lived in structures called longhouses. 
-Longhouses were long rectangular homes. Longhouses were made by building a frame from saplings, or young trees. They were then covered with bark sewn together. There was a long hallway with rooms on both sides. Sleeping platforms, covered with deerskin, lined each wall. There were also shelves for storing baskets, pots, and pelts. Pelts are the skins of animals with the fur attached. Several families would live in the long house, but the families were related to each other.-
source: <em>http://www.germantownbulldogs.org/pages/Indian%20Project/woodland2.html</em>
 
        
                    
             
        
        
        
Answer
Explanation:
The 19th century began on January 1, 1801, and ended on December 31, 1900. The term is often used to refer to the 1800s, the century between January 1, 1800 and December 31, 1899. The 19th century was the ninth century of the 2nd millennium.