12. True or false: The U. S. has been a safe haven for many refugees, particularly in the nineteenth (1 point) and twentieth centuries.
O true
O false

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.