What kept the missouri compromise from being a permanent solution

Draw conclusions  why might a cause like italian unification successfully draw people of very different backgrounds together?  

Match each treaty with its description. treatys- a the munich agreement b the pact of steel c the molotov-ribbentrop pact descriptions- 1- an alliance between germany and italy 2- an agreement between germany and the soviets dividing eastern europe 3-an agreement between germany, france, italy, and britain granting germany a small part of czechoslovakia in return for peace

Brianliestttme : ) -why was pakistan created?