What is the name and location of a mountain range that serves as a border between two countries

Distance that the transcontinental railroad covered from omaha to san francisco.

When you cross a time zone going east, what happens to the time

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.