Since then however the US has become subject to a number of adverse influences both planetary and extra-systemic that both feed off and seek to control the nation.
In addition, the US takes up much of the burden of planetary defense against lower level alien groups. The cost is a significant drain on the US.
At the higher levels of existence there are positive entities seeking to lead Earth humanity towards its proper functionality and functions.
Your question uses the term "managing". This is rather too strong a term. Further, the US is not easily a single nation and may fragment like the Soviet Union.
Contrast the fragmentation of the US society with the forced unity of China.