In the period between and , nearly one million immigrants entered the United States each year, mostly from close bordering nations for the sole purpose of .

Which of the following is an advantage of using nuclear power plants to produce electricity?

Which region on the map would have been directly affected by the infestation of the boll weevil in the late-19th and early-20th centuries? a) 5 b) 4 eliminate c) 3 d) 2

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?