1. Atlantic coast
   the Gulf Coast region
2. Pacific coast

In the United States, lighthouse building started on the Atlantic coast and then moved south across the Carolinas to the Gulf Coast region, then to the Great Lakes and finally to the Pacific coast.

1. Cape Cod lighthouse
   Cape Hatteras lighthouse
2. Fort Niagara lighthouse

The 193-foot (59-meter) Cape Hatteras lighthouse, located on the outer banks of North Carolina, was moved half a mile inland in 1999 to avoid being swallowed by the encroaching Atlantic Ocean.

1. war
   global competition
2. commerce

Trading ventures caused the first lighthouses to spring up in areas with large coastal populations and growing businesses.

1. Lighthouses became bigger.
   Lighthouse bulbs became brighter.
2. Lighthouses became automated.

As the 20th century progressed, lighthouses gradually became automated, with remote sensors and automatic timers that replaced lighthouse keepers.

1. one
   three
2. five

Only one U.S. light station -- Boston Light -- is permanently manned, but others continue to be vital navigational aids along the nation's coasts.

1. New York
   New Jersey
2. North Carolina

New Jersey's Sandy Hook lighthouse is both the oldest lighthouse and the country's first octagonal lighthouse.

1. a bed and breakfast
   a museum
2. an amusement park

It was once used to guide weary sailors safely home, but today, the Admiralty Head lighthouse entertains visitors as a museum and tourist attraction.

1. Cape Ann lighthouse
   Brant Point lighthouse
2. Grosse Point lighthouse

The Cape Ann lighthouse, north of Boston, is actually made up of two separate lighthouses 300 feet (91 meters) apart.

1. Henry David Thoreau
   Walt Whitman
2. Ralph Waldo Emerson

Henry David Thoreau described the Cape Cod lighthouse as the "first seen by those approaching the entrance of Massachusetts Bay from Europe."

1. Cape Flattery lighthouse
   Fort Niagara lighthouse
2. Cape Neddick lighthouse

Located about 30 miles (48 kilometers) south of Vancouver Island, the Cape Flattery lighthouse is the northernmost lighthouse in the lower 48 states.