In 1792 the Spanish first sighted Point Roberts and called it Zepeda Island. When close scrutiny revealed the Fraser River delta joined the "Island" to the mainland on the north, they charted it as Punta Zepeda. That summer, Captain George Vancouver gave the area its present name in honor of his friend, Captain Henry Roberts.

The large Indian population, dating prior to 500 B.C., called the area Teeltenem. Their many middens provided a wealth of information for anthropologists and archaeologists from many countries.

Point Roberts is separated from the rest of Whatcom County, Washington by a portion of British Columbia's lower mainland and is generally accessible by land only by a 23 mile drive through Canada from Blaine. If it were not for this connection to British Columbia, it would very likely be considered one of the San Juan Islands.

A first glance at the map often inspires the comment that "The Point" became a U.S. Territory through error or oversight. This was not the case. After years of joint occupation of the disputed area between the Columbia River and Alaska known as the Oregon Territory, James K. Polk was elected president of the United States on the campaign slogan "Fifty-Four Forty or Fight".

While his government asserted that the title of America to the entire territory unquestionable, Polk and his secretary, James Buchanan made a definite offer of a boundary at 49 degrees with the line straight across Vancouver Island, with no commercial privilege to be granted to the British south of the line, with the exception of free ports on the Island. This offer was rejected and withdrawn.

On April 18, 1846, notice was forwarded to London that the U.S. Congress had adopted a joint resolution abrogating the treaty of 1827 which provided for joint occupancy.

The British emissary, Richard Packenham, had previously been advised that the last concession which could be expected of America was in bending the boundary at 49 degrees around the lower end of Vancouver Island. The English had come to look upon Fort Victoria as the future center of their settlements on the coast and were willing to give up territory on the mainland to keep Vancouver Island.