How did secession work?  Did all the southern states secede together?

How did James K. Polk add Oregon Territory to the United States?

In their secession documents, southern states repeatedly cited their concern over one issue as the reason they were leaving the Union.  This one issue was 

Which of the following is/are true of the Oregon Trail?

What was the trigger for western expansion?   What drew large numbers of people into the  far west before the Civil War?

Why were southerners so concerned about the US tariff in the 1820s and 1830s?

According to the lecture, what were the four events between 1854-1860 that caused so much controversy, they resulted in Civil War in 1861.  What were these events?  

Lectures noted that the California Gold Rush is really overstated in history.  The amount of gold realized in California was under one million dollars’ worth – hardly worth all the attention it has received.

Americans got very interested in settling Oregon territory and the far west in the mid-1800s.  Consider, however, that the Pacific side of North America was separated from the United States by thousands of miles and the Rocky Mountains.  How did Americans even know that there was good land out there?

Why did it take ten years to get Texas into the United States?  You would have thought Americans would have been happy to add such a large amount of territory to their nation.