What were the mistakes made by the settlers of the roanoke colony and the jamestown colony?

Two books are used to model tectonic plates

How did the voting rights act and the 15th amendment combine to improve individual rights for african americans

Germany italy and japan formed the tripartite pact in part because they: a. hoped to convince the united states to stay out of world war ii b. share the ruling philosophies based on communist economics c. resented the agreements they were forced to sign at the munich conference d. believed their territories were threatened by aggressive foreign states