For various strategic, political, and ideological reasons, the US initially provided some support to the Nationalists, viewing them as a bulwark against the spread of communism in Asia. This assistance included equipment, munitions, training, and a small number of military advisers.
However, as the civil war intensified, and the CPC made significant territorial and political gains, the United States became more cautious about its involvement. The US gradually reduced its support for the Nationalists and eventually suspended it altogether in 1946, as efforts were made to broker peace between the warring factions.
Despite the US support, the CPC ultimately gained control of mainland China in 1949, while the Nationalist government retreated to the island of Taiwan, marking the start of the period commonly referred to as the "Cold War" between the US-led Western bloc and the Soviet Union-led Eastern Bloc.