Which effect did the columbian exchange have in the americas? a. spread diseases b. decreased warfare c. increased indigenous populations d. introduced maize

A.Spread diseases

Explanation:

The Colombian exchange is a process that took place between the 15th and 16th centuries, when agricultural products and other foods from the New World (the American continent) were discovered in the Old World (Europe, Africa and Asia) and vice versa. broad also includes technological advances, demographics and even diseases.

richard milhous nixon (january 9, 1913 – april 22, 1994) was the 37th president of the united states, serving from 1969 to 1974, when he became the only president to resign (quit). he is also known for corruption and the watergate scandal which resulted in the public losing trust in him and his resignation.