¿Qué es la diferenciación progresiva?

Look at the map of cities in the united states at the turn of the twentish century what impact did railroads have on cities across the united states at the turn of the twentish century

Why is this statement not a hypothesis? sunflowers require soil and plenty of sunlight and water to grow and thrive. a. it is a well-known fact. b. it is a proven theory. c. it is not falsifiable. d. it is difficult to test.

What was the purpose of the federalist papers? a. to revise the articles of confederationb. to oppose ratification of the constitution c. to encourage support for the ratification of the constitutiond. to invite people to the constitutional convention