HELLO.  Its called 'propaganda' and its not illegal.  As much as it is disgusting.
Russia, China and yes, the US are experts at it.
Advertising for/against a nation, party, candidate is done everywhere all the time, unfortunately its seldom truthful.
In fact, its the US that champions 'freedom of speech' allowing all kinds of libelous statements to stand where in other nations they would be sued.
btw: Trump Won because of the undemocratic 'electoral college system', as he got 3 million less actual votes than Clinton.  Not 'majority rules' in America.