What, in addition to geographic boundaries, might have kept the people of the huang river civilization from traveling to far-distant regions? they feared that their bronze weapons would be no match for the iron weapons of ancient egypt. they could get everything locally that they needed to survive and grow. they had learned about the other river valley civilizations but feared contact would bring invasion. they had not yet developed a system of money based on coins.

the hollywood film industry of 1950 was threatened on several different fronts. television broadcasting was rapidly becoming the dominant entertainment medium in the united states. the paramount anti-trust consent decree requiring separate ownership for production companies and theater chains had gone into effect on 1 january 1950. large numbers of young men and women were marrying, having children, and moving to the suburbs, which affected the viability of downtown first-run movie theaters. foreign revenues were endangered by protectionist tactics including quota systems, high taxes, and blocked funds. finally, the morality and patriotism of hollywood films and filmmakers were under attack from government, religious, and citizens' groups.

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