After the Qin Dynasty collapsed in 207 BC after four years of civil war, Liu Bang established the Western Han Dynasty
<span>The Supreme court declared the northwest ordinance constitutional, meaning that the lands promised to natives by the US would be given to them. That being said, the land was very soon after, taken back when Americans expressed anger over the fact that they couldn't have that land.</span>
Nationalism caused World War 1 . People put nationalism in their country above other countries which caused a lot of conflict
