Answer:
C
Explanation:
The new Bolshevik government were struggling to run the country as money was running low, people were starving, so they decided to back out of WW1, this made the other European countries see them as weak and not legit. In the conference after WW1 to decide what to do with Germany and the aftermath, Russia wasn't invited because they backed out of the war early.
Most people lived in the city for opportunities. Middle class or lower class lived in the slums.
Wait did you already get it?
For example state laws are laws that people only have to follow in that state. While federal laws you have to obey nationwide. For example the legal drinking age is 21 or so. If a state were to try to lower it, it would be impossible. So state laws and federal laws work together to decide the drinking limit.