Sarlahi. Nepali Congress President Gagan Kumar Thapa has stated that building the nation is not possible by one person alone and that he will work by uniting everyone.Addressing a meeting with voters in Dhankol of the district on Wednesday evening, under Sarlahi Constituency No. 4, he mentioned that he came here with the objective of sending a message connecting the Madhes region to the country, and assured that he would work by winning the trust of the voters.President Thapa said,