What is the name of a government ruled by a small group of wealthy people?

What is the main idea of this excerpt? 1.1.3

Because the texas constitution does not have a "necessary and proper" clause, a government powers are almost unlimited b. much of what is included in the constitution is improper c. the governor has to make the laws d government is limited to what is in the constitution

The information box says that the han added 4,000 miles of wall.refer to the mileage scale.how can this be true?