Which of these terms best describes the source of historian use to support an argument

Which impact did the civil war have on the spread of disease in texas a. disease decreased bc people left the area to fight in the war b. disease increased bc medicine was in short supply. c. disease increased bc many new diseases were brought to the area d. disease decreased bc confederate doctors distribute new medicines to local communities

Capitalism competed with dominance in the twentieth century communism merchantilism free enterprise feudalism

How did the environments in north america affect the development of america indian cultures in the period just before europeans arrived