How was the roosevelt corollary a major change to the monroe doctrine?

Iron making developed in china almost a thousand years later than in the middle east. true false

Pls quickly! which of the following statements about spanish plantations is not accurate? a. spanish plantation screw sugarcane for export to spain. b. the spanish had a little concern for the lives of the indians who worked on the plantations. c. spanish presentation grew a wide variety of crops and sent the produce to many different european countries. d. to replace the native americans our dying off the spanish important african slaves.

What was the most explosive issue facing the united states prior to the start of the civil war?