two countries. The intensity of the cooperation between Algeria and the United States is illustrated by the number and frequency of senior-level visits made by civilian and military officials of both countries. Relations between Algeria and the United States have entered a new, dynamic phase. While characterized by close collaboration on regional and international issues of mutual interest, ties between both countries are also defined by the significance and level of their cooperation in the economic area. The number of US corporations already active or exploring business ventures in Algeria has increased significantly over the past few years, reflecting growing confidence in the Algerian market and institutions. Senior officers of the Algerian Army, including its Chief of Staff and the Secretary General of the , have made official visits in the United States. Algeria has hosted US Navy and Coast Guard visits and took part with the United States in NATO joint naval exercises. The increasing level of cooperation and exchanges between Algeria and the United States has generated bilateral agreements in numerous areas, including the Agreement on Science and Technology Cooperation, signed in January 2006. An agreement was concluded recently between the Government of Algeria and the Government of the United States, entering into force on November 1, 2009, pursuant to which the maximum validity for several categories of visas granted to Algerian citizens coming to the United States was extended to 24 months. A mutual legal assistance treaty and a Customs Cooperation Agreement will also be signed soon. On 20 January 2013, the United States Department of State issued a travel warning to United States citizens for the country of Algeria in response to the In Aménas hostage crisis. Algeria has stated that it is dedicated to sustaining its good relations with the U.S. in July 2016. In 2020, the United States recognized Moroccan sovereignty over the disputed territory of Western Sahara in exchange for Moroccan normalization of relations with Israel. Algeria said the U.S. decision to recognize Moroccan sovereignty over Western Sahara "has no legal effect because it contradicts U.N. resolutions, especially U.N. Security Council resolutions on Western Sahara". Algerian leaders' visits to the United States Algerian leaders have visited the United States a total of seven times. The first visit took place on October 14–15, 1962 when Prime Minister Ben Bella stopped by Washington D.C. President Boumediene privately visited Washington and met with Nixon on April