Today some would say that those struggles are all over - that all the horizons have been explored - that all the battles have been won - that there is no longer an American frontier. But I trust that no one in this vast assemblage will agree with those sentiments. For the problems are not all solved and the battles are not all won - and we stand today on the edge of a New Frontier - the frontier of the 1960's - a frontier of unknown opportunities and perils - a frontier of unfulfilled hopes and threats.