Why did the korean war break out in 1950?

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

How did europeans and the introduction of european goods and ideas change native life ?

Which statements describe how reformers fought for social change in the progressive era? check all that apply. 1. they founded a state university to promote industrialization. 2. they began a civil rights movement to promote equality between races. 3. they made it legal to manufacture and sell alcohol. 4. they built thousands of new schools and required attendance. 5. they promoted abstinence from alcohol and supported prohibition.