The Republicans ran on an isolationist “America First” platform, and they keeping their promises. In the1930, there was a similar movement which played a major role in discouraging Jewish immigration from German (“none of our business, what the Germans do is there problem”)
Countries that relied on America, including Israel, Ukraine, Taiwan, Japan, South Korea and the European NATO members have been given fair warning that the United States will no longer be entangled in other countries affairs. If they have brains, they will radically cut spending social programs, and prepare to defend themselves in spite of American neutrality.