Answer: Supremacy Clause of the Constitution
Explanation:
Federal law is superior to State Law and this is enshrined in the Constitution by the <em>Supremacy Clause</em> which essentially states that the Constitution and Federal laws are the highest law of the land and state laws or constitutions cannot violate them.
If there is a conflict between the Constitution and state law, the Constitution takes precedence and if there is uncertainty as to whether there is a conflict, Federal courts can be approached all the way to the Supreme Court.
Voting rights I believe were restricted in that only one party the Socialist party was allowed. Some socialist countries at least where power was obtained by revolution in the world, like the Soviet Union or in Cuba had/have a one party system but still have democratic votes for various things, whereas more recently, socialist governments have come to power through the ballot box in countries like Venezuela or Bolivia.
They had similar trading methods and some of the same trading goods
The questions have notes that tell you what area of the book the answer is in. my suggestion is to read the chapter. even if you cant find the answers through that, it will help you come test time. if you're not up for that, you can easily google these. there's most likely an answer key, but try to find them in the book first.