Are there any maglev trains in the united states

Which fundamental right is protected in this excerpt ?

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

In the early 1800s which person would most likely express a positive viewpoint on abolition if interviewed a a. a runaway slave b. a plantation owner c. a southern politician d. a temperature reformer