What unresolved issue from wwi led to wwii?

From the soviet point of view, which reagan policy most threatened to create a new arms race? a. strategic defense initiative b. u.s. support for israel c. aid to the anti-soviet rebels in afghanistan d. iran-contra scandal

Which of the following was probably the most difficult challenge facing construction of the railroad?

Which of the following cultures were among the earliest known inhabitants of north america? a) mayab) incac) anasazi d) olmec