In the early exploration of north america all of the following rivers were important except:

st. lawrence
hudson
mississippi
arkansas

D. Arkansas

St. Lawrence was discovered by Jacques Cartier who was hired by the king of France.

The first European to discover the Hudson was Giovanni da Verrazzano, who sailed past the River's mouth in 1524. It was not until 1609 that Henry Hudson explored the length of the River up to present-day Albany.

Hernando de Soto reaches the Mississippi River, one of the first European explorers to ever do so.

salt is a type of solid, which means that it will when placed in water.

  a.  

soluble, float

  b.  

soluble, dissolve

  c.  

insoluble, settle

  d.  

insoluble, dissolve

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.