Since World War I, achieving and maintaining air superiority has been essential for victory in conventional warfare.

Since 1990, Hungary's top foreign policy goal has been achieving integration into Western economic and security organizations.

Since the 2005 general election the government has floated the idea of voluntary mergers of local councils, avoiding a costly reorganisation but achieving desired reform.

Since the state controls the means of coercion, and given the dependence of many groups in civil society on the state for achieving any goals they may espouse, state personnel can to some extent impose their own preferences on civil society.

Since achieving independence in 1946, Syria has harbored a lingering resentment and this issue has continued to be an irritant in Syrian-Turkish relations.

Since it was his long-standing advocacy of Athenian naval power which enabled the Allied fleet to fight at all, and it was his stratagem that brought about the Battle of Salamis, it is probably not an exaggeration to say, as Plutarch does, that Themistocles " is thought to have been the man most instrumental in achieving the salvation of Hellas ".

Since 1979, Passive Solar Building Design has been a critical element of achieving zero energy by educational institution experiments, and governments around the world, including the U. S. Department of Energy, and the energy research scientists that they have supported for decades.

Since achieving independence in 1971, Bahrain has maintained friendly relations with most of its neighbours and with the world community.

Since achieving stability in the early 1930s, the NFL had never fielded more than 10 teams.

Since saluting the flag was a primary means of achieving this legitimate goal, an issue of national importance was at stake.

Since about the year 2000, Mayo Clinic has also become known for achieving high quality at low cost.

Since their promotion the club have consolidated in the top flight, achieving a string of mid-table finishes under the command of several managers.

Since mobile communication technologies have evolved independently across continents, there is significant challenge in achieving seamless roaming across these technologies.

Since achieving independence from the United States in 1946 the Philippine Congress has established 124 more cities ( as of September 2007 ), the majority of which required the holding of a plebiscite within the proposed city's jurisdiction to ratify the city's charter.

Since his death, under Jiang's leadership, mainland China has sustained an average of 8 % GDP growth annually, achieving one of the world's highest rates of per capita economic growth, and became the world's fastest growing major economy.

Since achieving its 1st # 1 ranking in the 1994 – 95 season, UConn under Auriemma is 186-10 when playing as the nation's # 1 team.

Since achieving first light in 1996, the telescope has been used for a wide variety of studies ranging from our Solar System to stars in our galaxy and studies of other galaxies.

Since achieving IOC, Dyess has been recognized as the premier bomber training center and leads the fleet in maintaining the highest mission capability status of both its aircraft and avionics test stations and support equipment.

Since South Africa's return to the Olympic Games in 1992 after a four-decades long absence resulting from a ban imposed by the International Olympic Committee ( IOC ) for the country's Apartheid policies, it has seen mixed success ; achieving three gold medals, a silver and a bronze at the 1996 Summer Olympics in Atlanta but only managing two silver medals and three bronze medals at the 2000 Summer Olympics in Sydney.

Since the founding of the University, USTC has undertaken a large batch of national, ministerial and provincial research projects, achieving large number of research results.

Since achieving statehood in 1890, the U. S. state of Wyoming has been a one at-large Congressional District.

Since surprise in location was impossible, it was further indicated that Rommel had to depend on achieving surprise in time and speed.

Since achieving symmetry is a difficult task during human growth, requiring literally billions of cell reproductions while maintaining a parallel structure, achieving symmetry is a visible signal of genetic health.

Since independence from Portugal in 1975, a number of Angolan students continued to be admitted every year at high schools, polytechnical institutes, and universities in Portugal, Brazil and Cuba through bilateral agreements ; in general, these students belong to the Angolan elites.

Since gaining independence in 1991, hundreds of thousands of Armenia's residents have gone abroad, mainly to Russia, in search of work.

Since its independence, Armenia has maintained a policy of complementarism by trying to have friendly relations both with Iran, Russia, and the West, including the United States and Europe.

Since independence the party system has been dominated by the Botswana Democratic Party ( BDP ), which has never lost power since independence.

Since independence, Botswana has had the highest average economic growth rate in the world, averaging about 9 % per year from 1966 to 1999.

Since the independence in 1975 the official statistics in Cape Verde have no longer made statistics based on racial groups.

Since after independence from Portugal in 1975, a number of Cape Verdean students continued to be admitted every year at Portuguese high schools, polytechnical institutes and universities, through bilateral agreements between the Portuguese Government and the Cape Verdean Government.

Since gaining independence from the United Kingdom in 1960, Cyprus has had a record of successful economic performance, reflected in strong growth, full employment conditions and relative stability.

Since the 1990s, Ecuadoran foreign policy has been focused on the country's border dispute with Peru, an issue that has festered since independence.

Since independence, the two nations have maintained warm relations.

Since independence, the two Presidents ( Macías and Obiang ) have been the dominant political forces in Equatorial Guinea.

Since independence Eritrea's relationship with Ethiopia was entirely political, especially in the resuscitation and expansion of IGAD's scope.

Since regaining independence, Estonia has pursued a foreign policy of close cooperation with Western European nations.

Since independence, Fiji has been a leader in the South Pacific region, and has played a leading role in the formation of the South Pacific Forum.

Since independence in 1986, the FSM has established diplomatic relations with a number of nations, including most of its Pacific neighbors.

Since independence the party system is dominated by the conservative Gabonese Democratic Party.

Since independence, Gabon has been " one of France's closest allies in Africa ".

Since independence, nearly 300 small internal rebellions and civil wars have occurred in the country, including some changes of government.

Since independence, Indonesian ( a form of Malay and official national language ) is the language of most written communication, education, government, and business.

Since independence, Indonesian foreign relations have adhered to a " free and active " foreign policy, seeking to play a role in regional affairs commensurate with its size and location but avoiding involvement in conflicts among major powers.

Since independence in 1962 there have been political and economic disturbances, as well as a number of strong political leaders.

Since independence was granted in 1963 relations have been usually amicable, both being part of the Commonwealth of Nations, a successor to the empire which aims to promote mutual co-operation, democracy and other cultural values and ties with each member state.

Since its independence in 1961, Kuwait maintained strong international relations with most countries, especially nations within the Arab world.

Since that time, the parliament has demonstrated real independence from the executive branch.