The United States and the Soviet Union both invested in neutral Afghanistan's economy to try to gain influence during the Cold War. This included the Four Point Program in 1951, when Afghanistan and the United States signed an agreement in Kabul to help assist the economic development in the economy, and the construction of a 100 km pipeline from Termez to Mazar-i-Sharif that was built by Soviet technicians and began in 1954. Afghanistan received $18,500,000 from the Export–Import Bank of the United States to help them purchase U.S. material, equipment, and services for the Helmand River valley developmental project.