Trading helped them rise since they were immensely rich in things like Salt which was even worth more than gold in many parts of the world. Having secure trade routes and taxing traders made the country rich and powerful. This led to the decline since such wealth meant that many foreign enemies would want to attack them and take it from them which is what happened to both Mali and Songhai empires.
The answer is (C)
He Died when his barge was capsized in a storm
Answer:
He played a key role in helping the Russians with peace talks
I can only answer some of these but
3 - Harriet Beecher
4 - Popular Sovereignty
^ These are confirmed, I'm sure of it
Now, I'll assume on these ones
2 - Bleeding Kansas
1 - Wilmot Proviso
5 - Fugitive Slave Act
I apologize if I'm wrong on these