I assume you arent American. Sorry about that. In the US, presidents can be elected for a total of 8 years in office. The first election is for 4 years, and, If the president wishes, they can run again, leading to either another 4 years (If the people so decide), or they will leave office the 20th of January, the year after the election happens. (which is in November)

Socialism is very real. Communism is not. Real socialism is USSR, Most of PRC, North Korea, Laos, Cuba and until the 80's, Vietnam.

Youre not getting any closer

Nope

Well, he’ll be gone in 3. What makes you think China leads in those fields? And how does that coincide with America increasing its military?