Which grain brought to the new world allowed swamp land to be able to produce food?

Which piece of legislation signed by lyndon johnson brought an end to barriers preventing minorities from participating in elections?

The "nationalists" and fascists battled against the "republicans" and communists in a civil war in the 1930s in

When did martin luther king, jr. deliver his famous "i have a dream" speech? a. during the montgomery bus boycott b. during the birmingham campaign c. during his acceptance of the nobel prize d. during the march on washington