This study examines the shifts in the US decision-making process with regard to Jerusalem, spotlighting those taking place over the last decade and the structure and tendencies of Israeli lobby groups in the United States. The paper is divided into three sections: a theoretical approach to understanding US policy on Jerusalem; an outline of the history of Jerusalem in US foreign policy and Congress; and finally, Jerusalem, Israel and American policymakers, investigating the role of evangelicals, American Jews, Democratic and Republican party policy and the Israeli lobby in US decision-making on Jerusalem.