An experimental steam cannon guarding Port Royal Sound was built around 1900, in what is now Port Royal Plantation.
The cannon was fixed but its propulsion system allowed for long-range shots for the time.

In 1931, Wall Street tycoon, physicist, and patron of scientific research Alfred Lee Loomis, along with his brother-in-law and partner Landon K. Thorne, purchased 17,000 acres (69 km²) on the island (over 63% of the total landmass) for about $120,000 to be used as a private game reserve.
On the Atlantic coast of the island, large concrete gun platforms were built to defend against a possible invasion by the Axis powers of World War II.
Platforms like these can be found all along the Eastern Seaboard.
The Mounted Beach Patrol and Dog Training Center on Hilton Head Island trained U.S. Coast Guard Beach Patrol personnel to use horses and dogs to protect the southeastern coastline of the U.S.
In the early 1950s, three lumber mills contributed to the logging of 19,000 acres (77 km²) of the island.
The island population was only 300 residents.
Before 1956, access to Hilton Head was limited to private boats and a state-operated ferry.
The island's economy centered on shipbuilding, cotton, lumbering, and fishing.

The James F. Byrnes Bridge was built in 1956.
It was a two-lane toll swing bridge constructed at a cost of $1.5 million that opened the island to automobile traffic from the mainland.
The swing bridge was hit by a barge in 1974, which shut down all vehicle traffic to the island until the Army Corps of Engineers built and manned a pontoon bridge while the bridge was being repaired.
The swing bridge was replaced by the current four-lane bridge in 1982.

The beginning of Hilton Head as a resort started in 1956 with Charles E. Fraser developing Sea Pines Resort.
Soon, other developments followed, such as Hilton Head Plantation, Palmetto Dunes Plantation, Shipyard Plantation, and Port Royal Plantation, imitating Sea Pines' architecture and landscaping.
Sea Pines, however, continued to stand out by creating a unique locality within the plantation, called Harbour Town, anchored by a recognizable lighthouse.
Fraser was a committed environmentalist who changed the whole configuration of the marina at Harbour Town to save an ancient live oak.
It came to be known as the Liberty Oak, known to generations of children who watched singer and songwriter Gregg Russell perform under the tree for over 25 years.
Fraser was buried next to the tree when he died in 2002.

The Heritage Golf Classic was first played in Sea Pines Resort in 1969 and has been a regular stop on the PGA Tour ever since.
Also in 1969, the Hilton Head Island Community Association successfully fought off the development of a BASF chemical complex on the shores of Victoria Bluff (now Colleton River Plantation).
Soon after, the association and other concerned citizens "south of the Broad" fought the development of off-shore oil platforms by Brown & Root (a division of Halliburton) and ten-story tall liquefied natural gas shipping spheres by Chicago Bridge & Iron.
These events helped to energize the community, and the Chamber of Commerce started drumming up support for the town to incorporate as a municipality.
After the Four Seasons Resort (now Hilton Head Resort) was built along William Hilton Parkway, a referendum of incorporation was passed in May 1983.
Hilton Head Island had become a town.

The Land Management Ordinance was passed by the Town Council in 1987.
Disney's Hilton Head Island Resort opened in 1996, and the Cross Island Parkway opened in January 1997.
An indoor smoking ban in bars, restaurants, and public places took effect on May 1, 2007.
Shelter Cove Towne Centre opened in 2014.

Fort Howell, Fort Mitchel, the Zion Cemetery and Baynard Mausoleum, Cherry Hill School, Daufuskie Island Historic District, Fish Haul Archaeological Site (38BU805), Green's Shell Enclosure, Hilton Head Range Rear Light, Sea Pines, Skull Creek, SS William Lawrence Shipwreck Site, and Stoney-Baynard Plantation are listed on the National Register of Historic Places.
An experimental steam cannon guarding Port Royal Sound was built around 1900, in what is now Port Royal Plantation. The cannon was fixed but its propulsion system allowed for long-range shots for the time.
In 1931, Wall Street tycoon, physicist, and patron of scientific research Alfred Lee Loomis, along with his brother-in-law and partner Landon K. Thorne, purchased 17,000 acres (69 km²) on the island (over 63% of the total landmass) for about $120,000 to be used as a private game reserve. On the Atlantic coast of the island, large concrete gun platforms were built to defend against a possible invasion by the Axis powers of World War II. Platforms like these can be found all along the Eastern Seaboard. The Mounted Beach Patrol and Dog Training Center on Hilton Head Island trained U.S. Coast Guard Beach Patrol personnel to use horses and dogs to protect the southeastern coastline of the U.S.
In the early 1950s, three lumber mills contributed to the logging of 19,000 acres (77 km²) of the island. The island population was only 300 residents. Before 1956, access to Hilton Head was limited to private boats and a state-operated ferry. The island's economy centered on shipbuilding, cotton, lumbering, and fishing.
The James F. Byrnes Bridge was built in 1956. It was a two-lane toll swing bridge constructed at a cost of $1.5 million that opened the island to automobile traffic from the mainland. The swing bridge was hit by a barge in 1974, which shut down all vehicle traffic to the island until the Army Corps of Engineers built and manned a pontoon bridge while the bridge was being repaired. The swing bridge was replaced by the current four-lane bridge in 1982.
The beginning of Hilton Head as a resort started in 1956 with Charles E. Fraser developing Sea Pines Resort. Soon, other developments followed, such as Hilton Head Plantation, Palmetto Dunes Plantation, Shipyard Plantation, and Port Royal Plantation, imitating Sea Pines' architecture and landscaping. Sea Pines, however, continued to stand out by creating a unique locality within the plantation, called Harbour Town, anchored by a recognizable lighthouse. Fraser was a committed environmentalist who changed the whole configuration of the marina at Harbour Town to save an ancient live oak. It came to be known as the Liberty Oak, known to generations of children who watched singer and songwriter Gregg Russell perform under the tree for over 25 years. Fraser was buried next to the tree when he died in 2002.
The Heritage Golf Classic was first played in Sea Pines Resort in 1969 and has been a regular stop on the PGA Tour ever since. Also in 1969, the Hilton Head Island Community Association successfully fought off the development of a BASF chemical complex on the shores of Victoria Bluff (now Colleton River Plantation). Soon after, the association and other concerned citizens "south of the Broad" fought the development of off-shore oil platforms by Brown & Root (a division of Halliburton) and ten-story tall liquefied natural gas shipping spheres by Chicago Bridge & Iron. These events helped to energize the community, and the Chamber of Commerce started drumming up support for the town to incorporate as a municipality. After the Four Seasons Resort (now Hilton Head Resort) was built along William Hilton Parkway, a referendum of incorporation was passed in May 1983. Hilton Head Island had become a town.
The Land Management Ordinance was passed by the Town Council in 1987. Disney's Hilton Head Island Resort opened in 1996, and the Cross Island Parkway opened in January 1997. An indoor smoking ban in bars, restaurants, and public places took effect on May 1, 2007. Shelter Cove Towne Centre opened in 2014.
Fort Howell, Fort Mitchel, the Zion Cemetery and Baynard Mausoleum, Cherry Hill School, Daufuskie Island Historic District, Fish Haul Archaeological Site (38BU805), Green's Shell Enclosure, Hilton Head Range Rear Light, Sea Pines, Skull Creek, SS William Lawrence Shipwreck Site, and Stoney-Baynard Plantation are listed on the National Register of Historic Places.
Hilton Head Island, South Carolina