Question

How long has the metric system been a Federal Law in the United States?

a. Since 1790 when the French Academy of Sciences started it.
b. Since the Civil War
c. Approximately ten years
d. Approximately ten years before today's high school students were born.

Answer 1

b is the correct answer to this question

Answer 2

Answer: since the civil war

Explanation: it became law in 1866.