[Jim Richards]

from Wiki:

Cape Canaveral was chosen for rocket launches to take advantage of the earth's rotation. The linear velocity of the Earth's surface is greatest towards the equator; the relatively southerly location of the Cape allows rockets to take advantage of this by launching eastward, in the same direction as the earth's rotation. It is also highly desirable to have the downrange area sparsely populated, in case of accidents; an ocean is ideal for this. Although the United States has sites closer to the equator with expanses of ocean to the east of them (e.g. Hawaii, Puerto Rico), the east coast of Florida has substantial logistical advantages over these island locations. The tip of the cape is at LC-46 in Cape Canaveral Air Force Station.