The American sites have not yet been named.
The members said the group was also concerned with civil rights and cultural issues, including the preservation of a Native American site.
But most overseas economic development sites are less sophisticated than the top American sites.
While new pavilions are going up all around it, the American site is silent and deep in weeds.
But the first cement mixer has yet to arrive at the padlocked American site.
It quickly rose to become one of the top 10,000 American sites in traffic.
At least two Native American sites are in the area.
Franklin's house is not the only American historical site worth visiting in England.
A museum tells the natural and cultural story of the oldest American Indian site one can visit in the state's park system.
Burnham has estimated that it would cost $25 million to develop an American site for 1990.