Do you want vague details? Westward expansion was when the colonists began pushing West and migrating past the mountains further into Northern America. As this happened relationships with the Native Americans intensified as colonists began forcing more and more Native Americans off of their lands.
Hope this helps! (:
The clause is really a state's rights clause. A state may not pass a law that makes something illegal that was legal before the law was passed. In other words if a state suddenly passed a law that said it is no longer legal to park your car in front of any government building, but it was legal to do so yesterday, the police cannot come to your door and issue a ticket for parking in front of a government building because you did it yesterday.
The constitution actually uses the phrase ex post facto law in Article 1 Section 10 Clause 1.
First time political transferred from one to another
<span>The leaders of Great Britain and the Soviet Union supported dropping the bomb.</span>