How many other explorers came before Cabeza de Vaca and which country sent them?

Idon't really understand the question. it counts for 20% of my lesson grade and i really need putting the answer into words. anything will . i need asap so im awarding 30 points.a disagreement between states of the united states concerning the rights of states vs. the authority of the national government led to the civil war. state governments were forced by war into a subservient position. what might happen if national governments ceded their authority to a world government by international treaty?

How were slavery and indentured labor in american colonies similar

This amendment made cuba an american protectorate and forced cuba to cede guantanamo bay to the u.s.