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During the years from 1965 to 1970 American attitudes shifted toward support of voluntary fertility control with many more people supporting elective and contraception. Gallup polls taken in 1972 based on 1574 respondents showed that 64% of whites and 51% of blacks agreed: abortion should be a decision between a woman and her doctor. 3 out of 4 Americans agreed that birth control services (counseling information supplies) should be provided for sexually active teenagers. Highest support for both birth control and came from better educated more affluent Westerners. Causes of these attitude changes may be traced to factors such as availability of effective contraceptives alternate roles for women and liberalization of restrictive laws concerning contraception and sterilization.
Pomeroy et al. (Sun,) studied this question.