In the second half of the 20th century, the United States and its allies sought to uphold global order, provide strategic political leadership and military strength, and underwrite stability through assistance for reconstruction and development. With mixed success, the US has arguably taken responsibility for maintaining order and a stable balance of power. It has justified its involvement in strategic affairs by aiming for stability, reconstruction and development in troubled nations, and views this goal as synonymous with democratic ideals. In the opinion of some, America has carried this responsibility perhaps more than any other nation in the modern era.