While the United States has traditionally been at the forefront of space exploration and technological development, it is slowly losing its place at the head of the "space race", making way for Asian countries to assert their dominance in the field. With recent events, such as the discovery of a gravitational wave on Venus by a Japanese spacecraft or China's launch of a quantum satellite, the United States seem to be falling further and further behind, especially with the International Space Station to expire in a little over ten years.
In our minds, maybe we decided we already won the space race. The incoming administration certainly seems poised to continue it's disdain of education, science and exploration, so I doubt Drumph is going to push the space program. I'd bet other countries may be pursing space exploration with more vigor and more results.
Though the U.S. space program was developed for scientific reasons, a lot of its reason for being was a result of the Cold War between the United States and the Soviet Union. When the Cold War ended, much of the reason for the space program, and its expense, evaporated. The U.S. government is no longer willing to fund the space program as it once did, which allows other countries like Japan and China to step into the vacuum.
Even though other countries are gaining more and more knowledge and advancing when it comes to space exploration, it does not mean that the US will start to lose its position. The US has made major advances in the past and will continue to do so. They will come up with more and more new ways to advance in the future also.