However, many mainline Protestants, as well as many Catholics, have taken a more liberal view since the sexual revolution of the '60s-70's. Many still encourage abstinence before marriage and fidelity in marriage but recognize that this standard has changed within America. There is an assumption that couples in serious relationships are likely to engage in sexual relations, right or wrong. Therefore, they are likely to feel that in such cases artificial birth control is wise until marriage. Sadly, millions of babies, Protestant and Catholic, are born to unmarried women. This is certainly bad for those babies, their mothers and society.
The more pressing issue among Protestants is abortion. Some believe in abortion on demand - the decision of the woman, her control over her body. Some believe in abortion under certain conditions, such as the timing of the abortion (1st trimester, perhaps), the health of the mother, rape or incest. Some oppose abortion as the Catholic Church does - even though Catholics have abortions at about the same rate as Protestants. As in matters of doctrine, Protestantism generally has many viewpoints. Often the policy is to 'agree to disagree' agreeably.
I believe the last two states to allow the sale of birth control may have been Massachusetts and Connecticut, two states with heavy Catholic populations. Interestingly, they both permit same-sex marriage now and both tend to be quite liberal states generally. Let's face it, the Church's influence over lay Catholics has diminished sharply over the past half-century. Cafeteria Catholics may be the majority today.