If we become a communist and socialist country what will happen?

If you think that the USA will become a communist country under Biden, you really have been brainwashed by Trump supporters.

Democratic socialism is not the same as Russian socialism.

1)  There is no way that the US will ever become a socialist country or even a communist country. America is, and will always be, a strong capitalist country.
2)  Joe Biden is a member of the right wing Democrat Party which is strongly for big business and capitalism. The Democrat Party completely opposes both socialism and communism as economic systems. His political views sit in the centre of the Democrat Party while his running mate for Vice President  politically sits on the left of the Democrat Party, which makes her politics centre-right, at best. 
3)  The Republican Party is an ultra right wing political party with many fascist views and policies and have many fascists as members.
4)  American politics is skewed several degrees to the right of what is considered normal international political standards.

Well first of all you would have to vote for a politician who wanted to take all banks, businesses, natural resources, property and land into government ownership, which is the first thing every communist country have done.

The land of sell out old fools. Joe will sell your children and grand children up the river. He will give 2 trillion to corporate scum under his green power bill.
The only thing green about it is all the green money his sponsors are making.

pointless question. Thanks to first-past-the-post there are no leftwing (or other "third") parties in Congress or Senate

You tell `em russian pig troll.  We`re coming for you.  >: )