Why was the middle ages period once reffered to
as the dark ages ?

We dont know much about this time.

Explanation:

Compared with other eras, historians dont know as much about this time. In some ways, this period of time has been lost to history

Because compared to other ages, historians didnt knowmuch about this time ,so it was kind of lost in time.

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.