Areason that millions of people left the great plains during the great depression was to find

Has anyone read the book "politisk tenkning" by raino malnes and knot midgaard? if so, can you tell me what can i write on my eassay about it? some thesis ori need to write 1500 !

Persuaded congress to adopt the missouri compromise in 1820. 1.) henry clay 2.) white southerners 3.) northerners 4.) thomas jefferson

Can someone me answer all the questions?