History questions (need it in 2 hours)

1)  What were some of the grievances that spawned the American Revolution? Was an independent nation inevitable or could the British have delayed it by compromising? 

2)  Why was the line between state and federal power left unclear in the U.S. Constitution? 

3) The U.S. Constitution never mentions slavery, yet the document supported the institution of slavery. How?

4)  What did the Emancipation Proclamation mean for African Americans in 1863 in practical terms? Were they free? 

5)  Why is the Battle of Gettysburg called the "high water mark" of the Confederacy? 

Detailed answer for each question. Need it in 2 hours please.