What is meant by the "snowball effect" of presidentaial primaries?

Which of the following was a difficulty faced by the ottoman empire in the 1700s and 1800s?   a.  financial independence      b.  lack of trained artisans      c.  refusal to trade with other nations      d.  rebelling ethnic groups

The slave dred scott sued for his freedom because he was born a free man. he had lived in a free state. slavery violated the 13th amendment he had been freed by pres. lincoln.

Donald trump will plan to use his emergency powers to build the wall between the us and mexico, instead of shutting down the government again?