Americans, and others, have used the term “Zionism” to relate to groups and individuals that have promoted the idea that Jews should settle in Palestine and build a commonwealth there. Zionist ideas and movements have had a long and varied presence in America, beginning in colonial times. Despite the absence of a unified Zionist program, both Christian and Jewish Zionists translated religious messianic yearnings into political, social, or cultural goals, varying in their motivations and visions. Christian Zionism has developed mostly among messianic-oriented Protestants, although at times other Christians too have supported Zionist goals. In recent decades, Christian Zionism has been associated with conservative evangelicals, in America as well as in other countries. Zionism developed a noticeable presence among Jews in America at the turn of the 20th century. In its first decades, the movement attracted few followers, most Jews preferring other political or ideological options. It gained more ground after the British issued the Balfour Declaration in 1917, and the movement grew further following the rise of the Nazis to power in 1933. During the 1960s–1980s, the majority of Jews in the United States embraced pro-Zionist views, which by that time both Christians and Jews understood as promoting support for Israel in the American public arena. The cooperation between Christian and Jewish Zionists, over the building of a Jewish commonwealth in Palestine or over supporting it, has been more extensive than standard histories of Zionism have suggested. Christian and Jewish Zionists have provided each other immense encouragement, offering validation and legitimizing each other’s messianic convictions and projects. Christian supporters have acted as pro-Zionist lobbies, attempting to influence American policies. Their activities became crucial during World War I and then again in the 1970s–2000s, with the resurgence of conservative evangelicalism in the United States. Cooperation between conservative American Christian and Jewish Orthodox messianic groups developed at the turn of the 21st century, with many evangelical Christians contributing to support Jewish settlers and organizations that prepare for the building of the Third Temple in Jerusalem. This alliance has stirred strong reactions among pro-Palestinian and liberal Christians and Jews, who object to what they see as one-dimensional support of right-wing Israeli causes on behalf of messianic interpretations they do not share. For many antagonists, Zionism has become synonymous with a state they oppose and agendas they see as hostile to their cause. Self-identification as Zionist is currently prevalent among Modern Orthodox Jews and conservative evangelical Christians. Many others, including former liberal Christian supporters and progressive Jews, in the United States, Europe, and Israel, have moved to define themselves as post-Zionists, if not as non-Zionists altogether.