Answer:
For the U.S. it implimented the technique of keeping boats and ships sailing in groups as to make it harder to attack.
It was industrialization occurring in Russia by the Tsar, which was opposed by socialist groups and the problems faced without reform, a less centralized government leading to the popularity of socialist groups, a ruthless Tsar who imposed censorship and the violence shown in the failed revolution of 1905, the waste of life in ww1 caused by lack of funding for the army.
Answer: A. The size of the empire increased as a result of the trajan's conquests.
Explanation: This is because Trajan conquered the region of Dacia, Nabataean kingdom in Arabia, and more. These places were added to the empire as a result of the size of the empire increasing.
I also did this test question so trust me.
Answer: hey use this link