"The overall U.S. role in the world since the end of World War II in 1945 (i.e., over the past 70 years) is generally described as one of global leadership and significant engagement in international affairs. [...] Certain statements and actions from the Trump Administration have led to uncertainty about the Administration's intentions regarding the future U.S. role in the world. Based on those statements and actions, which the Administration often organizes under a theme of 'America First,' some observers have speculated that the Trump Administration may want to change the U.S. role in one or more ways. A change in the overall U.S. role could have profound implications for U.S. foreign policy, national security, and international economic policy, for Congress as an institution, and for many federal policies and programs. [...] An initial potential issue for Congress is to determine whether the Trump Administration wants to change the U.S. role, and if so, in what ways. A follow-on potential issue for Congress--arguably the central policy issue for this CRS [Congressional Research Service] report--is whether there should be a change in the U.S. role, and if so, what that change should be, including whether a given proposed change would be feasible or practical, and what consequences may result."
CRS Report for Congress, R44891
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html