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 answer is D) They did not gain support amongst many Congressional conservatives

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).