How many native americans were there in 1491?

Which of the following resulted from the passage of the dawes act in 1887?

What event started the space race and made americans feel their security was threatened a.) alan shepard's suborbital flight. b.) the launch of sputnik c.) the launch of explorer d.) the cuban missle crisis

Which event occurred in 1943 and to make the allied victory possible choose all answers that are correct