Why did military tensions increase in europe before world war 1?

Which of the following is an effect that constantine's conversion to christianity had on the roman empire?

An effect of the steamboat's popularity was that fewer people traveled by rail. o steam locomotives became less popular. people began to build canals in the united states and europe. o more people began to travel between the united states and europe.

Jim has 16 books doug has 10 fewer books than jim how many books does doug have?