Do Americans need visas and passports to go to Saipan? Or just an ID card.

Americans don't need visas and passports to go to Saipan, because Saipan is an American territory, and they only need American ID cards to go.

Saipan

Saipan, an island of the Northern Mariana Islands in the western Pacific Ocean. The highest point, Tapojo, is 466 meters above sea level. 1565 ~ 1899 was ruled by Spain. From 1899 to 19 14, it belongs to Germany. 1920 Japanese occupation. 1944 was occupied by the US military and became an important air base. 1962 became the capital of American Trust Territory of Pacific island countries. Now it mainly produces desiccated coconut, and also produces taro, cassava, yam, breadfruit and bananas. There are commercial docks and international airports. The population is about 52,200 (2010). On June 28th, 2009, the United States federal government took over the immigration affairs of the Northern Mariana Islands.

1986 officially joined the United States, and national defense and diplomacy are under the unified jurisdiction of the US government. On June 28, 2009, immigration and labor affairs were managed by the United States. The political system is a representative democracy of the president, and the executive, legislative and judicial powers are separated. The governor is the head of government and implements a multi-party system. The Governor and Councillors are also elected by voters.