Why did many of president kennedy's "new frontier" programs fail? a. his assassination led to their being revoked by congress. b. he used too many executive orders to put them into effect. c. the american people refused to participate in most of them. d. they did not gain support amongst many congressional conservatives?

The correct answer is D. "They did not gain support amongst many Congressional conservatives."

Kennedy's New Frontier program was supposed to help individuals in American society both economically and socially. This included increased funding to elementary and secondary schools and providing health insurance to the nation's elderly individuals through the Medicare program. However, Congressional conservatives did not pass these programs. One of the biggest reasons why these failed to pass was due to the cost of these requests.