How did the cumberland gap change western settlement will give award please help

How did the spanish prove to be excellent allies in the war? give examples?

At what age must a person begin receiving their roth 401(k) payments?

Which environmental change allowed people to travel by land between asia and north america a.human apaption to arctic environments b.the introduction to horses to north america c.the formation of ice sheets on land d.a rise in ocean temperatures