okay what type of writing is this !!
Explanation:
The independent variable is being controlled or manipulated.
From article [unknown] Roosevelt tends to use repetition, employing the phrase "last night" several times, to stress the number of coordinated attacks carried out by the Japanese.
Hope this helps a bit, there are many possible answers :)
The correct way is to capitalize it and just state World War I and World War II. It is not necessary to put the s to show plural. I hope this helps.