GUWAHATI, March 6 ? US Ambassador to India Robert D Blackwill today said that for facilitating a condition for foreign investment in the North East region of India a political solution to the region?s insurgency problem is a must. Blackwill, who is on a hectic tour of the NE region, said that though the region has immense potential for economic development, particularly in the agriculture, handicrafts and tourism sectors, impediments like insurgency, remote location and lack of infrastructure, are standing on the way of its attaining prosperity. The factor of insurgency-related violence is...