To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)
It was constantly attacked by foreign countries and this made it get weaker
Answer:
Explanation:
A. It acted as a system of checks and balances.
Answer:
c. the study of history
Explanation:
the study of historical writing.
the writing of history.
