"Trade missions of US to India's major cities are going on and we are in the process of expanding it to other areas including the north east," he told reporters here.
"We are learning about increasing business opportunities in the N E region and American companies have shown interest for investments," the envoy, who is on a visit to Assam and Arunachal Pradesh, said.
Climate change and renewal of energy were being focussed on by the USA, Burleigh said his country was, however, open to collaboration in almost all major areas of interest. "We are open to exploring virtually any area for investment."
USA was currently participating in a conservation programme at Kaziranga National Park in Assam, he said and expressed satisfaction at the 'amazing' pace of development activities taking place in the state and its congenial atmosphere for investment.