What was the main reason for the decrease in native americans in new england by the 1670s
a. being driven out by puritan leaders

b. overcrowding by english colonists

c. diseases caught from the europeans

d. warfare with the colonists over the fur trade

Option: C. diseases caught from the Europeans

Explanation:

When the Europeans reach the New World, they not only brought settlers with them but diseases too. Native Indians were helpless to protect themselves because they were not immune to diseases like smallpox, chickenpox, cholera, diphtheria, influenza, measles and so on. Approximately,  about 12,000 Native Americans in New England were living during 1670, which was one-tenth of their original population years ago.

by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.