Religion has played a constant role in the United States–Israel relationship. Christian and Jewish interests have shaped U.S. foreign policy, especially after the rise of the Zionist movement in the late 19th century and the establishment of the state of Israel in 1948. The role of religion Israel has historically depended on three interlinking factors: the influence of domestic political considerations in the calculations of American policymakers, the prominence of the Middle East in U.S. diplomatic and strategic thinking, and the beliefs and attitudes of individual policymakers, both their own religious convictions and their assessment of how important religious beliefs are to the American people. Religion has alternately strengthened and strained the U.S. relationship with the Zionist movement and the state of Israel. At some moments, such as the 1930s, religious attitudes and prejudices worked against closer cooperation. At other times, such as the Israeli–Egyptian peace summit of 1978, religious forces played a prominent role. As a state with special religious significance for many Americans, Israel provides a window into how religion functions in U.S. foreign policy, how its function has changed over time, and how religion has acted as an independent variable in political and policy outcomes.