Moral, political, and strategic factors have contributed to the emergence and durability of the U.S.-Israel alliance. It took decades for American support for Israel to evolve from “a moral stance” to treating Israel as a “strategic asset” to adopting a policy of “strategic cooperation.” The United States supported Israel’s creation in 1948 not only because of the lobbying efforts of American Jews but also due to humanitarian considerations stemming from the Holocaust. Beginning in the 1950s, Israel sought to portray itself as an ally of the United States on grounds that America and Israel were fellow liberal democracies and shared a common Judeo-Christian cultural heritage. By the mid-1960s, Israel was considered a strategic proxy of American power in the Middle East in the Cold War, while the Soviet Union armed the radical Arab nationalist states and endorsed a Palestinian “people’s wars of national liberation” against Israel. Over the subsequent decades, Israel repeatedly sought to demonstrate that it was allied with the United States in opposing instability in the region that might threaten U.S. interests. Israel also sought to portray itself as a liberal democracy despite its continued occupation of territories that it conquered in the Arab-Israeli War of 1967. After the terrorist attacks of September 11, 2001, and the rise of regional instability and radicalism in the Middle East following the 2003 U.S. invasion of Iraq and the Arab Spring of 2011, Israel’s expertise in the realms of counterterrorism and homeland security provided a further basis for U.S.-Israel military-strategic cooperation. Although American and Israeli interests are not identical, and there have been disagreements between the two countries regarding the best means to secure comprehensive Arab-Israeli and Israeli-Palestinian peace, the foundations of the relationship are strong enough to overcome crises that would imperil a less robust alliance.